期刊文献+
共找到20篇文章
< 1 >
每页显示 20 50 100
莫氏袭官与忻城土县的教育文化——广西忻城土司秘史之三 被引量:3
1
作者 黄雪梅 《柳州师专学报》 2003年第1期105-109,共5页
忻城县学(也称儒学)由兴至废,历时57年,受教育者寥寥无几。莫氏袭官后500余年,县学废而不立,史称"忻城土县例不建学"(即沿例不建县学)。自第四任土官后,始建官家私塾,又建社学、义学,"诗书之声渐出蛮乡",使"... 忻城县学(也称儒学)由兴至废,历时57年,受教育者寥寥无几。莫氏袭官后500余年,县学废而不立,史称"忻城土县例不建学"(即沿例不建县学)。自第四任土官后,始建官家私塾,又建社学、义学,"诗书之声渐出蛮乡",使"边城之地,乎向化"。第十二任土官制定《教士条规十六则》,是忻城迄今为止发现的明、清时期莫氏土官有关教育文化思想理论比较完整的文献,也是其他土司记载教育文化史料文献所罕见的。从中可以略窥古代汉儒学在忻城的传播和壮民族接受中原教育文化熏陶的一个侧面。莫氏袭官实行愚民政策,搞文化禁锢,实施"文致治平"。 展开更多
关键词 莫氏袭官 忻城土县 教育文化 广西
下载PDF
东海县着力推动农村土地经营权抵押贷款
2
作者 吴建国 《当代农村财经》 2017年第1期32-32,共1页
江苏省东海县是一个传统的农业大县,16万农户承包了141万亩土地。为了盘活这份"沉睡的资产",把农民丰富的资源变成发家致富的资本,东海县早在2012年就试水农村土地经营权抵押贷款。2015年12月获批全国农村承包土地经营权抵押贷款试点... 江苏省东海县是一个传统的农业大县,16万农户承包了141万亩土地。为了盘活这份"沉睡的资产",把农民丰富的资源变成发家致富的资本,东海县早在2012年就试水农村土地经营权抵押贷款。2015年12月获批全国农村承包土地经营权抵押贷款试点县(市、区)后,东海县委、县政府抓住机遇, 展开更多
关键词 抵押贷款 地经营权 地确权 江苏省东海 流转交易 风险补偿 可得性 土县 产权交易 风险基金
下载PDF
饶平置县过程考略
3
作者 陈春声 《中国地方志》 2024年第3期77-83,M0005,共8页
在方志、正史等史料中,饶平置县年份记载颇有不同,之所以出现这种情形,是与当时当地社会转型的复杂状况直接关联的,需要对一个较大的地方历史背景进行考察才能判断出现不同记载的真正缘由。明代中叶广东潮州府新建饶平县的过程,实际上... 在方志、正史等史料中,饶平置县年份记载颇有不同,之所以出现这种情形,是与当时当地社会转型的复杂状况直接关联的,需要对一个较大的地方历史背景进行考察才能判断出现不同记载的真正缘由。明代中叶广东潮州府新建饶平县的过程,实际上是当时更大范围的地域社会转型过程的一部分,各种文献关于建县年份的不同说法,反映了时人和后人对该复杂历史过程记忆的差异。 展开更多
关键词 潮州 饶平 历史记忆
原文传递
Changing Rules of Physical and Chemical Properties of Eucalyptus uraphylla spp. Forest at Different Ages in Southwest Yunnan Province 被引量:5
4
作者 赵筱青 丁宁 闫平 《Agricultural Science & Technology》 CAS 2012年第6期1298-1302,共5页
[Objective] The aim was to study on changing rules of physical and chemical properties of Eucalyptus uraphylla spp. forest at different ages in Southwest of Yunnan Province. [Method] In the research, field survey and ... [Objective] The aim was to study on changing rules of physical and chemical properties of Eucalyptus uraphylla spp. forest at different ages in Southwest of Yunnan Province. [Method] In the research, field survey and laboratory analysis were adopted to study on physical and chemical properties of soils for the Eucalyptus uraphylla spp. at the first cutting ages in Lancang County. [Result] With the increasing of forest ages, for physical properties of soils, soil bulk density was increasing, and soil structure became poor; water contents in soils and capillary porosity were improving, but total soil porosity and non-capillary porosity were decreasing. For chemical properties, pH of soil dropped, but soil acidity improved; organic matter, total N, hydrolysable nitrogen, available phosphorus, and available potassium all declined; exchangeable Ca and Mg were improving due to fertilization and Ca and Mg lower consumption. The results showed that plays important roles in water absorption of soils and vegetation growth were improved with age increase by Eucalyptus uraphylla spp. forest, but ventilation and fertility declined accordingly. [Conclusion] The research indicated that dry branches and fallen leaves should be preserved and nutrient cycling should be protected during introduction and management of Eucalyptus uraphylla spp. to guarantee the nutrients in dry branches and leaves are back to soils, providing theoretical references for management of forest plantation and environment protection. 展开更多
关键词 Eucalyptus uraphylla spp. Physical and chemical properties Soil fertility Lancang County
下载PDF
Study on Status quo of Nutrients in Soils of Farmlands in Gonggar County and Related Countermeasures
5
作者 郭健斌 张红锋 洛桑达瓦 《Agricultural Science & Technology》 CAS 2013年第2期295-297,307,共4页
[Objective] The aim was to analyze nutrients distribution and proportion in soils of farmlands of Gonggar County in Tibet. [Method] According to survey of soils in Tibet, nutrients of farmlands in Gonggar County were ... [Objective] The aim was to analyze nutrients distribution and proportion in soils of farmlands of Gonggar County in Tibet. [Method] According to survey of soils in Tibet, nutrients of farmlands in Gonggar County were analyzed and the countermeasures were proposed to achieve sustainable development of nutrients in soils. [Result] In Gonggar County in Tibet, farmlands with insufficient and less organic matter occupy 58.38%; farmlands with moderate contents of total N occupy 47.71%; farmlands with insufficient and less alkali-hydrolyzable nitrogen represent 82.36%; the farmlands with moderate and rich total P take up 49.40% and 21.59% ; farmlands with insufficient and less rapidly available P represent 67.33%; farmlands with richer and rich total K occupy 76.14% ; farmlands with moderate and insufficient rapidly available K represent 72.21%. [Conclusion] Based on nutrients in soils of farmlands, the countermeasures for sustainable utilization of nutrients in farmlands are proposed, including increase of organic fertilizer, soil testing and formulated fertilization and adjustment of acid-base balance. 展开更多
关键词 Gongga County Soils of farmland Status quo of nutrients
下载PDF
集资百万元 保护热水资源
6
作者 范强 《水资源保护》 CAS 1990年第4期56-56,共1页
地热水是自然赋于人类的宝贵资源,具有高医疗效果的热水尤为宝贵。河北省平山县温塘温泉就因其高效治疗运动系统和皮肤病而闻名省内外。然而,由于人们对它的认识不足,在地表冷水贫乏的情况下,当地农民用热水灌溉,与各用热水单位争水。
关键词 热水资源 地热水 河北省平山 医疗效果 运动系统 土县 居民生活用水 供水不足
下载PDF
Impacts of Land Use Change on Ecosystem Service Value in Yanchi County of Ningxia 被引量:3
7
作者 杨越 孙保平 +3 位作者 哈斯 杜会石 赵岩 赵瑞 《Agricultural Science & Technology》 CAS 2013年第11期1687-1692,共6页
Based on TM image data in 1989, 1995, 1999, 2003, 2006 and 2009 of Yanchi County of Ningxia, the land use date of Yanchi County in each year were extracted supported by RS and GIS technology, and used to analyze the d... Based on TM image data in 1989, 1995, 1999, 2003, 2006 and 2009 of Yanchi County of Ningxia, the land use date of Yanchi County in each year were extracted supported by RS and GIS technology, and used to analyze the dynamic change of land use. The land use data were studied for estimating the change of ecosystem services value caused by the land use change of Yanchi County, using the evaluation method of China terrestrial ecosystem services value. The results showed that the changes of land use were obvious during 1989 to 2009. The area of woodland and construction land had an increasing tendency; grassland area changed from decreasing to increasing, which was in contrary to farmland and un-used land areas (from increasing to decreasing); water area fluctuated slightly. The ecosystem services value of Yanchi County had an increasing tendency during 1989 to 1995, because the increasing woodland area had took the major role in raising the total ecosystem services value. The grassland accounted for a large proportion of the total ecosystem service value of Yanchi County, with its contribution rate from 49.8% to 60.4%. And the composition of the ecosystem services value of Yanchi County happened benign change for the increasing contribution rate of woodland. The ecosystem services value sensitivity index of each land use type was less than 1, indicating that the ecosystem services value of Yanchi County lacks flexibility on its service value index, and the research results are reliable. 展开更多
关键词 Ecosystem services value Land use change Yanchi County of Ningxia
下载PDF
实施高产攻关 稻茬麦亩产过八百
8
作者 王林坤 姜侠 《安徽农业》 1996年第10期4-4,共1页
关键词 小麦 生产技术 生产管理 安徽 土县
下载PDF
Soil Erosion and Vegetation Succession in Alpine Kobresia Steppe Meadow Caused by Plateau Pika——A Case Study of Nagqu County, Tibet 被引量:22
9
作者 WEI Xinghu LI Sen +1 位作者 Yang Ping Cheng Huaishun 《Chinese Geographical Science》 SCIE CSCD 2007年第1期75-81,共7页
This paper evaluated the impacts of mounds created by the plateau pika (Ochotona curzoniae) on the vegetation composition, structure, and species diversity of an alpine Kobresia steppe meadow in Nagqu County, Tibet ... This paper evaluated the impacts of mounds created by the plateau pika (Ochotona curzoniae) on the vegetation composition, structure, and species diversity of an alpine Kobresia steppe meadow in Nagqu County, Tibet Autonomous Region, China. Based on mound height or the depth of erosion pit, we defined five stages of erosion and compared the floristic features of communities at these stages with those in undisturbed sites. In the study area, the mounds and pits covered up to 7% of the total area. Lancea tibetica, Lamiophlomis rotata, and Potentilla biflarca were the dominant species in erosion pits, and Kobresia pygmaea, the dominant species in undisturbed sites, became a companion species in eroded areas. In the process of erosion, the original vegetation was covered by soil ejected by the pika, then the mounds were gradually eroded by wind and rain, and finally erosion pits formed. The vegetation coverage increased with increasing erosion stages but remained significantly lower than that in undisturbed sites. Improved coverage eventually reduced soil erosion, and pit depth eventually stabilized at around 20cm. Aboveground biomass increased with increasing erosion stage, but the proportion of low-quality forage reached more than 94%. The richness index and Shannon-Wiener index increased significantly with increasing erosion stage, but the richness index in mound and pit areas was significantly lower than that in undisturbed sites. 展开更多
关键词 plateau pika alpine Kobresia steppe meadow vegetation succession diversity TIBET
下载PDF
Rural Landscape Types and Recreational Value Spatial Analysis of Valley Area of Loess Plateau:A Case of Hulu Watershed,Gansu Prov-ince,China 被引量:2
10
作者 DONG Suocheng CHENG Hao +3 位作者 LI Yu LI Fujia WANG Zhe CHEN Feng 《Chinese Geographical Science》 SCIE CSCD 2017年第2期286-297,共12页
Rural landscape is a complex of natural landscape and human landscape, with various values. The recreational value of rural landscape is a kind of comprehensive benefit with economic, social and ecological, which is p... Rural landscape is a complex of natural landscape and human landscape, with various values. The recreational value of rural landscape is a kind of comprehensive benefit with economic, social and ecological, which is provided by the rural landscape as a recrea- tional resource. Loess Plateau is located at the junction of northern and northwestern of China, with serious water and soil erosion and fragile ecological environment. Jingning County is the national poor county, belonging to Liupanshan concentrated poverty areas. Hulu Watershed in Jingning is the typical valley area of Loess Plateau. In the past few decades, Jingning facing the fragile ecology and pov- erty, has been focusing on apple industry, forming unique rural landscape, exploring an ecological development path, and making much progress in green industrialization and urbanization. The author, according to the apple tree's growing stages, divided the rural landscape of Hulu Watershed into 15 types and analyzed its spatial patterns. The recreational value of Hulu Watershed was evaluated at 1.8 x 108-3.6 ~ 108 yuan (RMB) in 2014, by Travel Cost Method and Contingent Valuation Method. The territorial differentiational features of recreational value were that the higher value landscape types concentrated in the surrounding areas of towns and central vil- lages, and the areas along the traffic and river had more development potentiality. The main influence factors were the construction of rural landscape and the development of recreation industry. And the development paths of different landscape types were also proposed. The research conclusions can provide reference for the landscape exploration and recreation industry development in the similar underdeveloped areas in the valley area of Loess Plateau with fragile ecology and poverty. 展开更多
关键词 rural landscape recreational value Hulu Watershed Jingning County Loess Plateau
下载PDF
Environmental Factors Affecting Temporal and Spatial Dynamics of Soil Erosion in Xingguo County, South China 被引量:12
11
作者 WANG Ku SHI Xue-Zheng +5 位作者 YU Dong-Sheng SHI De-Ming CHEN Jing-Ming XU Bin-Bin LIANG Yin LI De-Cheng 《Pedosphere》 SCIE CAS CSCD 2005年第5期620-627,共8页
By using soil erosion maps of four different time periods and a digital elevation model (DEM), in combination withthe remote sensing and GIS technologies, soil erosion dynamics in Xingguo County of Jiangxi Province in... By using soil erosion maps of four different time periods and a digital elevation model (DEM), in combination withthe remote sensing and GIS technologies, soil erosion dynamics in Xingguo County of Jiangxi Province in South Chinawere analyzed on both temporal and spatial scales in soils of different parent materials, altitudes and slopes. The resultsshowed that from 1958 to 2000 severe soil erosion was coming under control with a decreasing percentage of the land undersevere erosion. It was also found that the soils developed from Quaternary red clay, granite and purple shale were moresusceptible to soil erosion and that areas sitting between 200 to 500 m in altitude with a slope less than 3° or between7° to 20° where human activities were frequent remained to be zones where soil erosion was most likely to occur. Theseareas deserve special attention in monitoring and controlling. 展开更多
关键词 GIS remote sensing soil erosion South China Xingguo County
下载PDF
Spectral Response of Different Eroded Soils in Subtropical China: A Case Study in Changting County, China 被引量:1
12
作者 LIN Chen ZHOU Sheng-lu +2 位作者 WU Shao-hua ZHU Qing DANG Qi 《Journal of Mountain Science》 SCIE CSCD 2014年第3期697-707,共11页
Hyper-spectral data is widely used to determine soil properties. However, few studies have explored the soil spectral characteristics as response to soil erosion. This study analysed the spectral response of different... Hyper-spectral data is widely used to determine soil properties. However, few studies have explored the soil spectral characteristics as response to soil erosion. This study analysed the spectral response of different eroded soils in subtropical China, and then identify the spectral characteristics and soil properties that better discriminate softs with different erosion degrees. Two methods were compared: direct identification by inherent spectral characteristics and indirect identification by predictions of critical soft properties. Results showed that the spectral curves for different degrees of erosion were similar in morphology, while overall reflectance and characteristics of specific absorption peaks were different. When the first method is applied, some differences among different eroded groups were found by integration of associated indicators. However, the index of such indicators showed apparent mixing and crossover among different groups, which reduced the accuracy of identification. For the second method, the correlation between critical soil properties, such as soil organic matter (SOM), iron and aluminium oxides and reflectance spectra, was analysed. The correlation coefficients for the moderate eroded group were primarily between -0.3 to -0.5, which were worse than the other twogroups. However, the maximum value of R2 was obtained as 0.86 and 0.94 for the non-apparent eroded and the severe group. Furthermore, these two groups also showed some differences in the spectral response of iron complex state (Fep), Aluminium amorphous state (Alo) and the modelling results for soil organic matter (SOM). The study proved that it is feasible to identify different degrees of soil erosion by hyperspectral data, and that indirect identification by modelling critical soil properties and reflectance spectra is much better than direct identification. These results indicate that hyper-spectral data may represent a promising tool in monitoring and modelling soil erosion. 展开更多
关键词 Soil erosion Erosion degree HYPER-SPECTRAL Aluminium oxides Iron oxide SOM
下载PDF
Sources of rare earth elements REE+Y(REY)in Bayili Coal Mine from Wensu County of Xinjiang,China 被引量:2
13
作者 Jian-qiang XUE Jian-xin LIU +4 位作者 De-zhi HUANG Wei-jian ZHOU Chun-ming LIU Yu-sen CAO Chuang-hua CAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第10期3105-3115,共11页
By analyses on the trace elements of coals,host-rocks and wall-rocks,this study aims to trace the sources and evaluate the utilization prospects of REE+Y(REY)in coals from Bayili Coal Mine(Wensu,Xinjiang,China).The di... By analyses on the trace elements of coals,host-rocks and wall-rocks,this study aims to trace the sources and evaluate the utilization prospects of REE+Y(REY)in coals from Bayili Coal Mine(Wensu,Xinjiang,China).The distribution patterns of REY in the coals are divided into two groups,flat-type and heavy REE-enrichment type(H-type).The REY of the former was mainly from the gneisses of the basement of the coal-bearing basin,and that of the later was partly from hydrothermal solution.The host-rocks show two types of REY patterns,middle REE-enrichment type(M-type)and H-type,which are due to the injection of REY from acid terrestrial water and hydrothermal solution,respectively.Almost all the coal samples are plotted into the promising area on the diagram of percentage of critical elements(REY_(def,rel))vs ratio of sum of critical elements to the sum of excessive elements(C_(outl))and half of the coal samples have high contents of Ga closing to the cut-off grade of Ga deposit as by-product,which indicate that the REY and Ga in Bayili Coal Mine are of utilization prospects as by-product. 展开更多
关键词 source rare earth elements distribution pattern coal Wensu County(Xinjiang)
下载PDF
Land Use Allocation Based on Interval Multi-objective Linear Programming Model: A Case Study of Pi County in Sichuan Province 被引量:10
14
作者 WANG Hongrui GAO Yuanyuan +1 位作者 LIU Qiong SONG Jinxi 《Chinese Geographical Science》 SCIE CSCD 2010年第2期176-183,共8页
Adjusting and optimizing land use structure is one of the essential approaches to solve the conflict between land supply and demand. In this study,an uncertain interval multi-objective linear programming model was est... Adjusting and optimizing land use structure is one of the essential approaches to solve the conflict between land supply and demand. In this study,an uncertain interval multi-objective linear programming model was established and applied to analyzing the suitability of land use structure in Pi County of Sichuan Province. An adjustment scheme for optimizing land use structure was proposed on the basis of development planning drawn up by the local government. The results are summarized as follows: 1) the optimal adjustment scope for cropland area ranges from 27 976.75 ha to 31 029.08 ha,and the current area is less than the lower limit of the scope; 2) the optimal adjustment scope for garden land area ranges from 4 736.49 ha to 12 967.11 ha,and the current area is less than the lower limit; 3) the optimal adjustment scope for construction land ranges from 7 761.95 ha to 10 393.18 ha,and the current area is greater than the upper limit; 4) the optimal adjustment scope for industry and mining land ranges from 557.29 ha to 693.54 ha,and the current area exceeds the upper limit; and 5) the areas of forest land,grassland and other agricultural land are within the optimal adjustment scope. In order to maximize comprehensive benefit with the limited resources and the demand of sustainable development,the areas of cropland and garden land are supposed to be expanded properly,while the construction land should be controlled and reduced gradually,and the forest land and other agricultural land can be maintained at the current level in short period. 展开更多
关键词 land use structure optimization land supply and demand balance INTERVAL multi-objective planning UNCERTAINTY
下载PDF
拥有两处宅基地违法吗
15
作者 李配银 《农家之友》 2003年第4期50-50,共1页
编辑同志:我与父母在1989年分家另立户头,并经批准修建了一套住房。父母去世后,我于今年将父母原宅拆除盖新居。事隔数月,本村村委会经研究,决定收回我原住宅基地土地使用权,并报乡人民政府、县国土局。该局认为我拥有两处宅基地属违法... 编辑同志:我与父母在1989年分家另立户头,并经批准修建了一套住房。父母去世后,我于今年将父母原宅拆除盖新居。事隔数月,本村村委会经研究,决定收回我原住宅基地土地使用权,并报乡人民政府、县国土局。该局认为我拥有两处宅基地属违法,作出处理决定,限我在两个月内,将原宅基地建筑物和附属物全部清理掉,并完全恢复耕地面貌。请问。 展开更多
关键词 地管理法》 农村村民 宅基地面积 管理部门 宅基地
下载PDF
Landform Classification for Community Siting: A case Study in Quxian County, China
16
作者 ZHAO Ke DENG Zhao-hua 《Journal of Mountain Science》 SCIE CSCD 2015年第4期1025-1037,共13页
This study is to explore a suitable method to classify landform, in order to support the decision making for community siting in mountainous areas.It first proposes the landform classification for community siting(LCC... This study is to explore a suitable method to classify landform, in order to support the decision making for community siting in mountainous areas.It first proposes the landform classification for community siting(LCCS) method with detailed discussions on its rationality and the chosen parameters.This method is then tested and verified in Quxian county.The LCCS method entails twograde parameters, which uses relative relief as the first grading parameter, slope as the second, followed by a synthesis process to form a suitable landform classification system.By applying the LCCS method in Quxian county, the result shows that its use of watershed to identify geomorphometric units, and its use of the altitude datum concept, can effectively classify landform according to the local cultural traditions, and the economic and environmental conditions.The verification result shows that comparing to the conventional methods, the LCCS method respects to people's daily experience due to its bottom-up approach.It not only help to minimize the disturbance to the nature when choosing locations for community development, but also helps to prepare more precise land management policies,which maximizes agricultural production and minimizes terrain transformation. 展开更多
关键词 Landform classification Community siting Relative relief SLOPE Mountainous areas China
下载PDF
FOREST LANDSCAPE PATTERN DYNAMICS OF LUONINGCOUNTY IN HENAN PROVINCE AND ITS DRIVING FORCES
17
作者 DING Sheng-yan, QIAN Le-xiang, CAO Xin-xiang, LI Shuang, LI Hao-min(College of Environment & Planning, Henan University, Kaifeng 475001, P. R. China) 《Chinese Geographical Science》 SCIE CSCD 2003年第3期247-253,共7页
With the help of ARC/INFOR and ERDAS software, based on the information from forest resources distribution maps and TM images, four indices were chosen to analyze spatial pattern changes of forest landscape of Luoning... With the help of ARC/INFOR and ERDAS software, based on the information from forest resources distribution maps and TM images, four indices were chosen to analyze spatial pattern changes of forest landscape of Luoning County, Henan Province from 1983 to 1999. The results showed that: 1) The number and total area of patches were rapidly increased with time changes. The fragmentation degree of the landscape was increasing greatly. 2) The area of some forest patch types, especially shrub forest, economic forest, Populus spp. forest, Quercus spp. forest, sparse forest, deserted grassland etc. had been greatly changed. 3) The fragemation degree of each forest patch type became greater from 1983 to 1999. 4) The transition probabilities of deserted forest, economic forest, Pi-nus tabulaeformis forest, Populus spp. forest exceed 85%,Robinia pseuoacacia forest, deserted grassland, 65% and Quercus spp. forest, non-forest, shrub forest had smaller ones, which were 26.5%, 29.1% and 45.3%, respectively. The main transition trends of various patches were non-forest and Quercus spp. forest. During the course of transition, the types that 50% of area was remained were Quercus spp. forest, non-forest and shrub forest. According to above analyses, the main driving forces, such as the management policies, market economy factors and influences of human activities etc. were brought out. 展开更多
关键词 FOREST landscape pattern driving forces luoning county
下载PDF
正反比例综合教学的尝试 被引量:1
18
作者 钱宽杰 朱占君 《江西教育(管理版)(A)》 北大核心 1993年第5期40-41,共2页
近年来,随着教改的发展和深入,我们觉得应改变现行教材中“比→比例→正比例意义→正比例应用题→反比例意义→反比例应用题”的教学程序,提倡“比→比例→正、反比例意义→正、反比例应用题”的综合教学顺序,通过几年的尝试,效果很好,... 近年来,随着教改的发展和深入,我们觉得应改变现行教材中“比→比例→正比例意义→正比例应用题→反比例意义→反比例应用题”的教学程序,提倡“比→比例→正、反比例意义→正、反比例应用题”的综合教学顺序,通过几年的尝试,效果很好,既省时间又省力,也帮助学生减少了学习上的困难,具体做法如下: 一、重新组合教材,即在正、反比例意义教学后把练习十七和练习十九交融练习,在正、反比例应用题教学后,把练习十八和练习二十交融练习,使学生从整体上分析数量关系,这样既能使学生从认识相关联量到判断两量关系及运用比例概念解答应用题的整个过程都处于积极思考、认真判断的动态之中,又能使学生克服套用模式猜测题的不良思维习惯。 展开更多
关键词 反比例应用题 数量关系 综合教学 教学顺序 比例关系 现行教材 意义教学 总术 土县 成正比例
原文传递
大瑶山银杉群落
19
作者 黄盛全 《中国民族》 北大核心 1992年第8期40-40,共1页
大瑶山银杉群落位于广西金秀瑶族自治县县城东面12公里的土县山上,有银杉约150株,其中1号银杉高31米,4号银杉胸径87厘米,树龄均有580多年,被林业专家公认是目前世界上最高最大的“
关键词 林业专家 土县 广西龙胜 一级保护 孑遗植物 通直 针阔叶混交林 金秀瑶族自治 生长地 技术人员
原文传递
Soil Organic Carbon Stocks of Citrus Orchards in Yongchun County Fujian Province China 被引量:1
20
作者 WANG Yixiang WENG Boqi +2 位作者 TIAN Na ZHONG Zhenmei WANG Mingkuang 《Pedosphere》 SCIE CAS CSCD 2017年第5期985-990,共6页
Studies related to the quantitation and distribution of soil organic carbon (C) under different land use types can help to fill the knowledge gaps regarding estimation of the amount of C stored in soils at a global ... Studies related to the quantitation and distribution of soil organic carbon (C) under different land use types can help to fill the knowledge gaps regarding estimation of the amount of C stored in soils at a global scale. Orchards are an important land use type in southern China; the total area (1.15 x 107 ha) of orchards in China comprises approximately 20.5% of the area of all orchards worldwide. We assessed soil organic C stocks (SOCS) in citrus orchards in Yongchun County (consisting of 22 towns), Fujian Province, China in 1982 and 2010. The southeastern part of the county, an area featuring extensive citrus farming with a gently sloping landscape and low rates of water erosion, had the highest SOCS. In contrast, the lowest SCOS was observed in the northern part of the county, where steep hills with severe erosion problems are common and citrus orchards are sparsely distributed. From 1982 to 2010, the mean SOCS in citrus orchards increased from 22.1 to 41.7 Mg ha-1 which indicated that current management practices such as fertilization, irrigation, and cultivation enhanced soil C stocks. Further in-depth studies on the effects of these practices on C sequestration would be worthwhile and surveys of SOCS throughout Fujian Province are needed, to support efforts to mitigate global C emission. 展开更多
关键词 carbon emission carbon pool carbon sequestration KRIGING land use type management practices
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部