青海省门源县不同退耕还林模式生态效应研究  

Ecological Effects of Different Models of Conversion of Farmland to Forest at Menyuan County in Qinghai Province

作　　者：汪海蓉 WANG Hai-rong(Qinghai Provincial Forest Inventory and Planning Institute, Xining,Qinghai 810008)

机构地区：[1]青海省林业调查规划院,青海西宁810008

出　　处：《安徽农业科学》2018年第16期107-109,共3页Journal of Anhui Agricultural Sciences

基　　金：青海省林业厅资助项目(QHLY20170518)

摘　　要：[目的]研究青海省门源县不同退耕还林模式的生态效益。[方法]以撂荒地作为对照,通过野外采样、定点观测、室内试验,研究青海省门源县不同退耕还林模式生态效应。[结果]青海云杉+白桦、白桦、青海云杉林负氧离子浓度分别为2 216、2 077、1 907个/cm^3,平均为撂荒地的1.86倍;负氧离子寿命分别为15.63、14.67、13.46 min,平均为撂荒地的1.96倍;PM_(2.5)浓度分别为40.99、45.63、50.90μg/m^3,平均为撂荒地的0.65倍;土壤容重分别为1.21、1.24、1.26 g/cm^3,平均为撂荒地的0.80倍;土壤总孔隙度分别为52.39%、51.69%、50.24%,平均为撂荒地的1.24倍;土壤非毛管孔隙度分别为7.56%、7.15%、6.51%,平均为撂荒地的1.43倍;土壤有机质分别为3.09%、2.87%、2.67%,平均为撂荒地的1.42倍;土壤表层日较差分别为8.89、9.00、9.06℃,平均为撂荒地的0.80倍。[结论]不同退耕还林模式生态效应高低顺序为青海云杉+白桦、白桦、青海云杉、撂荒地。[Objective]To study the ecological effects of different models of conversion of farmland to forest at Menyuan County in Qinghai Province.[Method]Taking abandoned land as control,through ways of investigation,fixed-point observation and experimental data,ecological effects of different models of conversion of farmland to forest at Menyuan County in Qinghai Province were studied.[Result]According to the order of mixture of picea crassifolia and birch,birch,picea crassifolia,layland,the concentration of negative oxygen ions respectively were 2 216,2 077,1 907 pieces/cm3,1.86 times of layland; the life span of negative oxygen ions respectively were 15.63,14.67,13.46 min,1.96 times of layland;the concentration of PM2.5 respectively were 40.99,45.63,50.90 μg/m3,0.65 times of layland; the volume weight of soil respectively were 1.21,1.24,1.26 g/cm3,0.80 times of layland; soil total porosity respectively were 52.39%,51.69%,50.24%,1.24 times of layland; soil non-capillary porosity respectively were 7.56%,7.15%,6.51%,1.43 times of layland; soil organic matter respectively were 3.09%,2.87%,2.67%,1.42 times of layland; daily temperature-range of surface soil respectively were 8.89,9.00,9.06 ℃,0.80 times of layland.[Conclusion] Different models of conversion of farmland to forest have made different response to ecological effects. The order of ecological effects from high to low was as follows： mixture of picea crassifolia and birch,birch,picea crassifolia,abandoned land.

关 键 词：门源县 退耕还林模式 服务功能 生态效益 

分 类 号：S728.9[农业科学—林木遗传育种]