蛟河林业局有林地各林种面积变化的动态分析

本文采用统计分析的方法,分别统计1997年和2007年研究区域的有林地资源数据,通过比较两次调查的数据对比得出动态变化结论。

地理信息系统在森林分类经营中的应用

一、研究理论本文以黑龙江省大兴安岭林管局新林林业局的森林资源为研究对象,以森林资源的分类经营为研究目标,通过对各种二类调查因子(如海拔、坡度、地类、地被物等)的分析,提出森林分类经营的区划依据,并通过地理信息系统软件ARCVIEW 3.0来实现这一区划,最后提出塔源林场的森林分类经营区划图。

Biomass Carbon Sequestration by Planted Forests in China

The planted forest area and carbon sequestration have increased significantly in China,because of large-scale reforestation and afforestation in the past decades.In this study,we developed an age-based volume-to-biomass method to estimate the carbon storage by planted forests in China in the period of 1973-2003 based on the data from 1209 field plots and national forest inventories.The results show that the total carbon storage of planted forests was 0.7743 Pg C in 1999-2003,increased by 3.08 times since the early 1970s.The carbon density of planted forests varied from 10.6594 Mg/ha to 23.9760 Mg/ha and increased by 13.3166 Mg/ha from 1973-1976 to 1999-2003.Since the early 1970s,the planted forests in China have been always a carbon sink,and the annual rate of carbon sequestration was 0.0217 Pg C/yr.The carbon storage and densities of planted forests varied greatly in space and time.The carbon storage of Middle South China was in the lead in all regions,which accounted for 23%-36% of national carbon storage.While higher C densities (from 17.79 Mg/ha to 26.05 Mg/ha) were usually found in Northeast China.The planted forests in China potentially have a high carbon sequestration since a large part of them are becoming mature and afforestation continues to grow.

Biomass Carbon Storage and Its Sequestration Potential of Afforestation under Natural Forest Protection Program in China

Based on the data from China′s Seventh Forest Inventory for the period of 2004–2008, area and stand volume of different types and age-classes of plantation were used to establish the relationship between biomass density and age of planted forests in different regions of the country. Combined with the plantation area in the first-stage of the Natural Forest Protection(NFP) program(1998–2010), this study calculated the biomass carbon storage of the afforestation in the first-stage of the program. On this basis, the carbon sequestration potential of these forests was estimated for the second stage of the program(2011–2020). Biomass carbon storage of plantation established in the first stage of the program was 33.67 Tg C, which was majority accounted by protection forests(30.26 Tg C). There was a significant difference among carbon storage in different regions, which depended on the relationship of biomass carbon density, forest age and plantation area. Under the natural growth, the carbon storage was forecasted to increase annually from 2011 to 2020, reaching 96.03 Tg C at the end of the second-stage of the program in 2020. The annual growth of the carbon storage was forecasted to be 6.24 Tg C/yr, which suggested that NFP program has a significant potential for enhancing carbon sequestration in plantation forests under its domain.

Forest eco-compensation mechanism:a survey

China is a country with a vast territory and a large population but limited forest resources, which is mainly distributed in the economically less developed regions. Therefore, it is particularly important to address the issue to establish forest eco-compensation mechanism to overcome the problems of inequity between the people and promote the public incentive for forest management and conservation. The definition of eco-compensation is deeply discussed based on the literature review of national and international initiatives. According to summary and analysis of the empirical work of forest eco-compensation at international level,some significant inspirations are duaw on this paper. Based on them, this paper focuses on the forest eco-compensation mechanism of china. Firstly, integrating with the actual situation of china, the paper puts forward the policy framework of eco-compensation .The institutional framework of eco-compensation should be established among the multi-departments with different temporal and spatial scales. Secondly, the types and ranges of forest eco-compensation are further studied, that is three levels of forest eco-compensation such as micro-level, macro-level as well as media-level, and then the standards of eco-com-pensation are primarily estimated which include the three factors, namely direct expense of plantation opporiunity cost for forests protection and benefits of forest ecosystem services.Finally the recommendation is created in terms of above research conclusions, which is provide the vital important references for government policy making in the forest eco-compensation domain.

Latitudinal variation of leaf morphological traits from species to communities along a forest transect in eastern China

Comprehensive information on geographic patterns of leaf morphological traits in Chinese forests is still scarce.To explore the spatial patterns of leaf traits,we investigated leaf area(LA),leaf thickness(LT),specific leaf area(SLA),and leaf dry matter content(LDMC) across 847 species from nine typical forests along the North-South Transect of Eastern China(NSTEC) between July and August 2013,and also calculated the community weighted means(CWM) of leaf traits by determining the relative dominance of each species.Our results showed that,for all species,the means(± SE) of LA,LT,SLA,and LDMC were 2860.01 ± 135.37 mm2,0.17 ± 0.003 mm,20.15 ± 0.43 m2 kg–1,and 316.73 ± 3.81 mg g–1,respectively.Furthermore,latitudinal variation in leaf traits differed at the species and community levels.Generally,at the species level,SLA increased and LDMC decreased as latitude increased,whereas no clear latitudinal trends among LA or LT were found,which could be the result of shifts in plant functional types.When scaling up to the community level,more significant spatial patterns of leaf traits were observed(R2 = 0.46–0.71),driven by climate and soil N content.These results provided synthetic data compilation and analyses to better parameterize complex ecological models in the future,and emphasized the importance of scaling-up when studying the biogeographic patterns of plant traits.