玛纳斯河流域NPP时空变化及其生物多样性维护功能重要性评价

基于植被净初级生产力(NPP)法开展干旱区流域生物多样性维护功能重要性评价可为区域生态安全建设提供科学依据。基于玛纳斯河流域MODIS13Q1数据和环境数据，利用卡内基-艾姆斯-斯坦福方法模型(CASA)估算2001—2020年流域植被NPP,结合地形因子构建流域生物多样性维护功能重要性评价模型，利用地理探测器分析气候、地形、土壤类型等因子对流域NPP的空间异质性影响。研究结果表明：(1)近20年，流域植被NPP均值呈上升趋势，高值集中于山地区低山丘陵带和绿洲区中部，低值区分布于荒漠生态区；(2)从流域不同土地利用类型的NPP均值看，耕地>林地>草地>建设用地>未利用地>水域；(3)流域生物多样性维护功能的一般重要区、中等重要区、重要区和极重要区的数值范围为：0—0.12、0.12—0.22、0.22—0.47和0.47—0.84,分别占流域总面积的20.17%、20.14%、19.91%和19.85%,山地区低山丘陵带和绿洲区中部是流域生物多样性维护功能的极重要区；(4)年平均降水、土壤类型是流域NPP空间分异解释力最强的因子；各因子的影响呈非线性增强及...

Spatio-temporal change of net primary productivity and the evaluatation of the importance of biodiversity maintenance functions in Manas River Basin

Based on net primary productivity (NPP), the evaluation of the importance of biodiversity maintenance functions in arid watershed can provide a scientific basis for ecological security construction. Based on the MODIS13Q1 data and environmental data of the Manas River Basin, this study used the CASA model to estimate the vegetation NPP in the Basin from 2001 to 2020, and combined terrain factors to construct an evaluation model for the importance of biodiversity maintenance functions in the Basin. Effects of factors such as soil type on the spatial heterogeneity of the NPP in the watershed were analyzed by GeoDetector. The results show that:(1) in the past 20 years, the average NPP of vegetation in the basin has shown an upward trend, with the high values were concentrated in the low hilly belt of mountainous area and the central of oasis area, and the low-value areas were distributed in the desert ecological area; (2) From the average NPP value of different land use types in the Basin, the order was the cultivated land>forest land>grass land>construction land>unused land>water area; (3) The numerical ranges of the general important area, medium important area, important area and extremely important area of the biodiversity maintenance function of the basin are:0-0.12, 0.12-0.22, 0.22-0.47 and 0.47-0.84, accounting for 20.17%, 20.14%, 19.91% and 19.85% of the total area of the Basin. The central part of the oasis area and the low mountain and hilly belt of the mountain area are extremely important areas for the maintenance of biodiversity in the Basin; (4) The annual average precipitation and soil type are the factors with the strongest explanatory power of spatial differentiation of NPP in the Basin. The effects of natural factors on NPP in the Basin showed nonlinear enhancement and two-factor enhancement, with the interaction between annual average precipitation and altitude being the strongest (q=0.44), followed by the interaction with the annual average total solar radiation (q=0.42).