Study on Rational Land Use for Comprehensive Agro-development--A Case Study from Jixian County,Shanxi Province Using SWAT to simulate runoff under different land use scenarios in Xiangjiang River Basin Estimation of carbon balance under different land uses and long-term fertilizations in black soils of Northeast China Resource evolution pattern, land use change and related ecological effect in Hailun City Effects of lac-corn agroforest ecosystem on ground-dwelling antdiversity and functional groups The Optimizing Design of the Agro-economic System for Mengu Town of Fang County in Qingba Mountain District Analysis of landscape pattern and affecting factors in Huailai County