To determine the main functions of regional forest and focus of forestry construction to form the regional forestry economy with characteristics and ecological service system pattern with obvious advantages,we select ...To determine the main functions of regional forest and focus of forestry construction to form the regional forestry economy with characteristics and ecological service system pattern with obvious advantages,we select some indicators on Ceheng County in Guizhou Province, such as natural geography,socio-economic conditions,ecological environment and forests status. Using the quantitative classification method combining factor analysis and system clustering,we conduct quantitative county level forestry division. The results show that first using factor analysis to establish factor analysis model,and then using a handful of factors loading large amounts of information to carry out system clustering,is an effective quantitative classification method of forestry division,which can not only overcome the weakness of previous division mainly focusing on qualitative analysis,but also eliminate the correlation between indicators in the conventional classification methods; through the factor analysis of 30 indicators influencing the forestry development of each township in Ceheng County,the factor analysis model is established,6 factors loading 89. 94 5% of information amount are used to conduct system clustering on 14 townships in Ceheng County,and finally Ceheng County can be divided into five zones. This study not only enriches the theory of forestry division,but also provides reference for the forestry planning in Guizhou and division of related industries.展开更多
With the environmental deterioration caused by the advance of climate change, soil salinization is a serious and growing global problem. Currently about 7% of the world＇s land surface is threatened by salinization. C...With the environmental deterioration caused by the advance of climate change, soil salinization is a serious and growing global problem. Currently about 7% of the world＇s land surface is threatened by salinization. China is a country whose soils are severely affected by this problem, which, due to its extensive area, and wide distribution poses a serious threat to regional agricultural development. In this review, we summarize the framework for soil salinization research in China over the past 70 years, assess the weaknesses of existing research in both a domestic and international context, highlight the trends and key findings of global research about saline soils over the past 30 years, and propose six major fields and directions for future research on saline soil.展开更多
基金Supported by Guizhou Agricultural Scientific and Technological Project (2011GZ65518)
文摘To determine the main functions of regional forest and focus of forestry construction to form the regional forestry economy with characteristics and ecological service system pattern with obvious advantages,we select some indicators on Ceheng County in Guizhou Province, such as natural geography,socio-economic conditions,ecological environment and forests status. Using the quantitative classification method combining factor analysis and system clustering,we conduct quantitative county level forestry division. The results show that first using factor analysis to establish factor analysis model,and then using a handful of factors loading large amounts of information to carry out system clustering,is an effective quantitative classification method of forestry division,which can not only overcome the weakness of previous division mainly focusing on qualitative analysis,but also eliminate the correlation between indicators in the conventional classification methods; through the factor analysis of 30 indicators influencing the forestry development of each township in Ceheng County,the factor analysis model is established,6 factors loading 89. 94 5% of information amount are used to conduct system clustering on 14 townships in Ceheng County,and finally Ceheng County can be divided into five zones. This study not only enriches the theory of forestry division,but also provides reference for the forestry planning in Guizhou and division of related industries.
基金National Natural Science Foundation, No.40871255 The Scientific Research Foundation of Graduate School of Nanjing University, No.2012CL14
文摘With the environmental deterioration caused by the advance of climate change, soil salinization is a serious and growing global problem. Currently about 7% of the world＇s land surface is threatened by salinization. China is a country whose soils are severely affected by this problem, which, due to its extensive area, and wide distribution poses a serious threat to regional agricultural development. In this review, we summarize the framework for soil salinization research in China over the past 70 years, assess the weaknesses of existing research in both a domestic and international context, highlight the trends and key findings of global research about saline soils over the past 30 years, and propose six major fields and directions for future research on saline soil.
