Discussion on the relationship between Construction of Forest Towns and Reform & Development of State-owned Forest Farms

In recent years, China's social economy has continued to develop. While paying attention to the pursuit of the economy, people are paying more and more attention to the pursuit of quality of life. China has vast territory and abundant resources, forest resources are particularly rich, in order to make full use of forest resources and regulate the use and protection of forests, China has promoted the development of forestry by deepening the construction and reform of state-owned forest farms, and using forest resources to obtain benefits to meet people's living needs. This paper explores the necessity and advantages of building a forest town by analyzing the reform and development situation of state-owned forest farms.

A study on state-owned forest area stakeholders' behavior

The development of state-owned forest area plays a very important role in the development of Chinese forest industry, and even in the construction of national economy. As the backbone of Chinese forestry development, it contributes to Chinese economic development, ecological environment protection and social progress. How to balance all stakeholders' interest and behaviors remains as one of the focuses in the study of sustainable development of forest areas. On this basis, researches were carried out and described in the paper. Firstly, the paper goes through the concept and scope of state-owned forest area in China; Secondly, it defines the stakeholders of state-owned forest area, and discusses over the problems in stakeholders' behaviors from the aspect of responsibility, rights and interests; and Finally, it designs the stakeholders' behaviors on the basis of existing problems and provides constructive suggestions on deeper reform of state-owned forest areas.

Intensities of human disturbance dictate the floral diversity in tropical forest:the case of a secondary forest in Benguet, Philippines

This study inventoried the floral diversity of a secondary forest in Tuba,Benguet,Philippines as affected by different intensities of human disturbance.This study is unique from other land use studies in Southeast Asia in having conventional farms as the most disturbed land use while other sites have oil palm plantations.A total of 267 species belonging to 222 genera and 78 families was documented.Results showed that the level of human disturbance is the major factor affecting the floral diversity while the effect of elevation is secondary.The level of human disturbance is significantly associated with species richness,species composition,dominant species and biodiversity indices.Greater human disturbance,as in the case of conventional farms,results in lower species richness,predominantly weed composition,dominant weed species and lower biodiversity indices.On the other hand,lesser human disturbance(as in the case of secondary forest)leads to higher species richness,greater native species composition,dominance of indigenous species,and higher diversity indices.The most disturbed land use experienced the greatest loss of species richness,change in floristic composition and vegetation structure,as well as a shift from native to alien-dominated plant communities.These results showed that the effect of land use change is not limited to species richness but also to species composition,dominant species and biodiversity indices.Locally,the study is an important baseline data for biodiversity conservation of the Marcos Highway Watershed Forest Reserve.

Analysis of the Freezing Damage to Biennial Eucalyptus dunnii and Eucalyptus smithii in Haikou Forest Farm

In winter of 2013,cold weather occurred in Kunming,and biennial E. dunnii and E. smithii in Haikou Forest Farm suffered different degrees of freezing damage. The freezing damage to them was analyzed here. The results showed that in the families of E. dunnii,families suffering severe and especially severe freezing damage accounted for 7. 7%,while 92. 3% of families suffered moderate and below freezing damage; in the families of E. smithii,56. 7% of families suffered severe and especially severe freezing damage,while families suffering moderate and below freezing damage accounted for 43. 3%. There was significant difference between two species of eucalyptuses in tree height（ P 〈0. 05）,while there was extremely significant difference in freezing damage grade and index（ P 〈0. 01）. There was significantly negative correlation between the tree height and freezing damage grade of E. dunnii and E. smithii,with the correlation coefficients of- 0. 374 and- 0. 234. That is,the freezing damage grade would decrease with the increase of tree height.

Influence of Tea Plantations, Forest and Mixed Farming on Stream Flow and Sediment Loads, Case of Sondu Miriu River Basin, Kenya

The changing patterns of land cover and land use in the tropical river basin over time are critical. The hydrological phenomena at basin and sub basin scale are affected positively or negatively by dynamics of the land cover and land use patterns. Hence identifying causes and driving factors aid in taking appropriate measures to avert the impacts. This study determined the influences of sub basins dominated by tea plantations, forests and agricultural land uses in terms of streamflow and sediment flux variability in Sondu Miriu River Basin in Kenya, East Africa. Field-based investigations were conducted through sampling of flow velocities, turbidity and TSSC obtained from existing River Gauging Stations established within the three sub basins. The sub basin dominated by mixed farming land cover exhibits high turbidity approximately 620 NTU and high levels of total suspended sediment concentration (TSSC) of the order of 630 mg/l in wet seasons. The turbidity levels and TSSC were low in sub basins dominated by forest and tea plantations with approximately mean value of 17 - 29 NTU and 0.019 g/l. The sediment loads in sub basin dominated by mixed farming in the pre planting season in January to February were about 900 tonnes/day higher than that in crop growing season. In sub basins dominated by forest cover and tea plantations, sediment loads were low ranging between 2 - 7 tonnes/day. The relationship between stream flows and area under tea plantations, forests and mixed farming ranged between R2 of 0.025 and 0.16. Tea plantations and forests influence the stream flows and sediment yields in long term duration while in mixed farming variations were observed seasonally. The strong relationships between rainfall and stream flows at the sub basins ranging between R2 of 0.84 and 0.97 revealed the significance of rainfall in hydrologic response of the Sondu Miriu River Basin.

Effectiveness Evaluation of the Construction of the Natural Forest Resources Protection Project in Haikou Forest Farm of Kunming

The current situation about the natural forest resources protection project in Haikou Forest Farm of Kunming on the protection of forest resources, forest fire prevention, forest administration resource management, forest pests, and money management was briefed. Achievements made in the implementation of natural forest protection project in Haikou Forest Farm were analyzed, and problems existing in the project as well as corresponding countermeasures were expounded.

广西13家国有林场桉树资源变化分析

为实现桉树资源高质量发展,根据2003—2020年森林资源调查数据,对广西13家国有林场(高峰、七坡、树木园、东门、派阳山、钦廉、博白、六万、维都、三门江、黄冕、大桂山、雅长)桉树资源变化情况进行分析。结果表明:2003—2020年,桉树人工林面积从57782.4 hm^(2)增加到100126.75 hm^(2),蓄积从1631700 m^(3)增加到8556100 m^(3);单位面积蓄积量从21.66 m^(3)•hm^(−2)上升到85.5 m^(3)•hm^(−2);单位面积年均生长量从6.1 m^(3)•hm^(−2)•年^(−1)上升到24.7 m^(3)•hm^(−2)•年^(−1)。至2020年,在13家林场中场内桉树人工林面积达10000 hm^(2)以上有3家,5000~10000 hm^(2)的有6家,5000 hm^(2)以下的有4家;桉树人工林蓄积量1000000m^(3)以上的有2家,500000~1000000m^(3)的有7家,500000 m^(3)以下的有4家;单位面积蓄积量100 m^(3)•hm^(−2)•年^(−1)以上的有6家,80~100 m^(3)•hm^(−2)•年^(−1)的有3家,80 m^(3)•hm^(−2)•年^(−1)以下的有4家;单位面积年均生长量超过30.0 m^(3)•hm^(−2)的有1家,年均生长量25~30 m^(3)•hm^(−2)•年^(−1)的有4家,年均生长量20~24.9 m^(3)•hm^(−2)•年^(−1)的有6家,年均生长量小于20.0 m^(3)•hm^(−2)•年^(−1)的有2家。针对当前桉树资源经营管理中存在的突出问题,提出加强抚育管理、科学合理调整主伐年龄、加强自然灾害防控等建议。

基于RUSLE模型的帽儿山实验林场不同林分类型土壤侵蚀动态评估

为解决定量评估帽儿山实验林场不同林分类型土壤侵蚀动态变化的问题,以帽儿山实验林场1983、1993、2004、2016年4期二类调查数据和Landsat遥感影像数据为基础,采用修订后的通用土壤流失方程(Revised Universal Soil Loss Equation,RUSLE)模型对帽儿山实验林场平均土壤侵蚀量进行动态评估,并量化和分析不同林分类型与土壤侵蚀量间的关系。结果表明,4个时期帽儿山实验林场的年均土壤侵蚀量分别为0.26、0.24、0.10、0.17 t/(hm^(2)·a),其中各期土壤侵蚀强度处于0~1 t/(hm^(2)·a)的面积分别占总面积的98.79%、98.68%、99.88%、98.88%;1983—2016年土壤侵蚀强度未发生变化的区域占70.4%,高等级侵蚀强度向低等级侵蚀强度转移的面积占25.1%,而低等级侵蚀强度向高等级侵蚀强度转移的面积仅占4.5%,表明帽儿山实验林场土壤侵蚀状况整体趋势良好;6种林分类型中,软阔天然林、硬阔天然林、落叶松人工林、樟子松人工林、蒙古栎天然林和针阔混交天然林在1983年的平均土壤侵蚀量分别为0.150、0.161、0.054、0.110、0.121、0.083 t/(hm^(2)·a);到2016年,其平均土壤侵蚀量分别下降53.7%、61.2%、30.3%、83.0%、46.8%、23.2%;除软阔天然林、落叶松人工林和针阔混交天然林于2004—2006年期间土壤侵蚀量轻微增加以外(0.003~0.016 t/(hm^(2)·a)),其余林分类型平均土壤侵蚀量均呈逐年下降趋势。

水产养殖中水质与鱼类行为双向映射模型研究

在水产养殖中,水质参数与鱼类活动之间有着密不可分的相互映射关系。过去的监测更多偏向于单向映射,一般都是通过鱼类的行为表明水质的情况。针对仅仅通过鱼类行为反映水质情况会产生误判和滞后的问题,本文构建一种基于随机森林的鱼类行为与水质情况双向映射模型。双向映射模型不仅可以提供更多的信息从而提高预测的准确性,而且也可以通过相互验证提高模型的可靠性。首先,通过引入可变形卷积模块对YOLO v7进行改进,利用改进模型检测出视频中鱼类的位置再通过前后帧的坐标量化出鱼的游动参数。随后,将采集到的鱼类游动参数及对应的水质参数作为输入,使用随机森林模型进行分类、回归,分别完成鱼类游动参数和水质参数具体数值的预测以及指标异常级别的预测,从而得到双向映射关系。为了表明模型的泛化能力,分别在黎安港和新村港渔场2个数据集下进行实验。实验结果表明:提出的方法可以较好地实现鱼类行为与水质关系的双向映射,其中,分类实验平均准确率可以达到90.947%,回归实验决定系数R^(2)的平均值可以达到0.801。

大同山杉木人工林林分空间结构与种内竞争关系

为了解大同山国有林场不同龄组杉木人工林林分空结构特征与种内竞争强度的相关性,以大同山国有林场杉木人工林为研究对象,根据幼龄、中龄、近熟、成熟4个龄组共设置8块标准地,应用样地数据,通过计算林分空间结构参数,分析林分的空间结构特征和林分竞争关系。结果表明:(1)杉木人工林在水平维度上普遍处于密集状态,除幼龄林外,其他龄组的林木密集度指数较高,各个龄组杉木人工林的林分密度集分布在0.436 3~0.863 6,各龄组林分内对象木的密集程度处于密集状态。(2)杉木人工林的林分垂直结构较为简单,垂直空间的利用率较低,各龄组样地的林层指数随林龄增加而呈现减小-增大-减小的趋势,且各龄组大部分对象木的林层指数为0~0.33。(3)杉木人工林的密度集和竞争指数的相关性比林层指数和竞争指数的相关性相对较强,林分密集度和竞争指数的相关系数随林龄的增加呈规律性变化;林层指数和竞争指数也存在较强的相关性,但随林龄变化不明显。

景洪市国有林场经济发展现状与前景

国有林场是生态文明建设中的重要组成部分,而国有林场经济发展关系到国有林场的建设。为了更好的推动国有林场的发展,结合景洪市国有林场实际情况,根据现阶段景洪市国有林场发展的困难,实践分析了景洪市国有林场改革后的林区经济发展因素,提出实现景洪市国有林场经济发展和乡村振兴的策略和建议。

塞罕坝植被覆盖时空分异与驱动机制研究

研究塞罕坝林场植被覆盖变化及其驱动机制能够为区域植被保护与森林经营管理提供重要的理论依据。基于MODIS-NDVI、气温和降水数据,采用趋势分析、偏相关性分析、残差分析和相对作用分析等方法,分析塞罕坝林场2000—2020年不同植被覆盖的时空变化,探讨气候因素和人类活动对不同植被覆盖的驱动机制。结果显示:(1)塞罕坝林场植被覆盖的归一化差异植被指数(NDVI)低于0.55的区域归为低植被覆盖区,NDVI高于0.65的区域为高植被覆盖区,而NDVI为0.55~0.65的区域为中等植被覆盖区。(2)2000—2020年,不同植被覆盖等级NDVI的平均增长速率有所差异,低植被覆盖区NDVI平均增长速率较快;其次是中等植被覆盖区和高植被覆盖区;尤其是2007年之后,塞罕坝林场全域NDVI平均增长速率明显高于2000—2007的植被NDVI平均增长速率。(3)在不同植被覆盖等级区,NDVI的主要驱动因素也有所不同,低植被覆盖区NDVI主要受到人类活动的影响,其贡献率高达60.78%;中高植被覆盖区主要驱动因子存在着空间异质性,即中高植被覆盖区的西部和东南部的低海拔区主要受人类活动的影响,而东北部的高海拔区主要受到气候因素的影响。

大数据背景下国有林场数字化管理新策略

伴随网络、通信科技、云计算等先进科技的发展,我们迈入了一个全新的数字化时代。这一时代的来临,不但改变了我们的思维方式,更改变了我们的工作和生活方式。通过应用各种数据信息,各项管理的方式方法也得以改进和优化。国有林场森林资源的监督管理是一种很繁重的工作,数字化时代的到来,理应化繁就简,提升效率。本文将深入探讨在当今信息化数字化时代,就如何高效的处理庞大的数据、处理庞大的信息,分析国有林场森林资源数据管理的现状、查找存在的问题,提出参考性的意见,以期为林场森林资源高效管理提供的优解方案。

广宁红花油茶林与次生林土壤有机碳和养分的垂直分布特征

为比较广宁红花油茶Camellia semiserrata与次生林土壤有机碳和养分水平的差异,文章以广东省樟木头林场的广宁红花油茶林和次生林为研究对象,测定两种林分土壤的碳氮磷等指标,分析土壤有机碳的垂直变化规律及其影响因素,结果发现:(1)两种林分土壤容重均随土层深度的增加而增加,而总孔隙度、非毛管孔隙度和通气孔隙度随着土层深度的增加而下降;广宁红花油茶林土壤自然含水量、毛管持水量和毛管孔隙度均显著高于次生林,而非毛管孔隙度和通气孔隙度显著低于次生林;(2)两种林分土壤的总有机碳(TOC)、总氮(TN)、水解氮(HN)、速效磷(AP)、碳氮比(C∶N)、碳磷比(C∶P)和氮磷比(N∶P)均随着土层深度的增加而降低,而土壤pH值和全磷(TP)在各土层间无显著差异;次生林土壤TOC、TN、TP、全钾(TK)、速效钾(AK)和HN含量显著高于红花油茶林;(3)相关性分析表明,广宁红花油茶林表层土壤TOC与容重、TK呈显著负相关,与总孔隙度和通气孔隙度呈显著正相关;次生林表层土壤TOC含量与容重、毛管孔隙度和TK呈显著负相关,与HN、毛管孔隙度、通气孔隙度、TN呈显著正相关;次生林底层土壤TOC含量与HN、AP呈极显著正相关;另外,两种林分土壤的表层和底层土壤TOC均与C∶N和C∶P呈极显著正相关,说明表层土壤TOC更容易受到土壤物理性质的影响,而底层TOC受到C∶N和C∶P的调控。研究结果可知,广宁红花油茶林土壤TOC和N、P和K养分低于次生林,表明广宁红花油茶的生长和产量可能受到土壤氮磷钾养分供应的影响,未来应加强对广宁红花油茶林土壤氮磷钾的养分管理;两种林分土壤表层有机碳受到土壤物理性质的显著影响,表明抚育管理等措施将会改变土壤有机碳的含量。

河北省木兰围场国有林场植被碳汇计量方法初探

2022年7—8月,在河北省木兰围场国有林场(以下简称木兰林场)筛选出以白桦Betula platyphylla、落叶松Larix gmelinii、油松Pinus tabuliformis和蒙古栎Quercus mongolica为优势树种的样地开展森林碳汇计量活动,在该场二类连清数据的基础上建立30个微样地,通过对这些微样地进行调查和统计,初步探讨森林碳汇量的计算方法、调查方法、监测因素等。结果表明,2022年,木兰林场的森林蓄积量为833.93×10^(4) m^(3),生物量为733.21×10^(4)t,碳储量为377.10×10^(4)t,碳汇量为60.33×10^(4)t,年均碳汇量为12.07×10^(4) t·a^(-1);白桦、落叶松、油松和蒙古栎4个优势树种在不同龄组的蓄积量存在较大差异,其单位面积的生物量在不同龄组和树种之间存在一定的差异;单位面积年均碳汇量,油松是其他树种的数倍之多,其次是蒙古栎,落叶松居第三位,表明落叶松、蒙古栎和油松在固碳和碳汇方面具有较高的潜力。本文提出的县域陆表植被碳汇计测方法初步解决了传统植被调查中耗时耗力的问题,实现了“国家—省域—县域—乡镇—村街—地块”逐级区划的低成本高效率计测。

曲靖市国有海寨林场公益林优化调整情况分析研究

本文通过对曲靖市国有海寨林场公益林的优化调整前后情况进行了分析研究。首先概述了海寨林场的自然环境状况和森林资源分布现状,指出了公益林优化调整前的情况。然后在此基础上,以2021年国土“三调”林地范围为依据,将2020年最新国家级、省级公益林数据与国土“三调”矢量数据叠加分析,在坚持生态优先,确保生态区位重要、生态状况脆弱区域林地得到有效保护的前提下,对海寨林场公益林优化调整情况进行详细地分析研究。最后对海寨林场公益林优化的结果进行了归纳总结,客观分析了公益林管理过程中存在的问题,并提出了相应的合理建议,使其能够精准支撑森林生态效益补偿制度,充分发挥公益林的生态效益和社会服务功能。

国有林场自然资源确权登记操作规程研究

以祁连山国家公园肃南片区、榆中县贡井林场、洮河生态建设局作为国有林场自然资源确权操作规程研究区域,进行国有林场确权登记操作流程研究,划分了不同类型国有林场自然资源登记单元,确定了登记范围和边界,明确登记范围内自然资源的数量、质量、面积、公共管制等基本信息,查清单元内各类自然资源的所有权、用益物权等权属信息,通过确权登记操作规程的研究,形成了验证区各登记单元内自然资源分布成果。祁连山国家公园肃南片区登记单元内草原资源分布最多,贡井林场登记单元内森林资源分布最多,洮河生态建设局登记单元内森林资源分布最多。

普文试验林场森林土壤养分状况研究

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