植被叶面积指数与覆盖度定量表征红壤区土壤侵蚀关系的对比研究  

COMPARISON OF BETWEEN LAI AND VFC IN RELATIONSHIP WITH SOIL EROSION IN THE RED SOIL HILLY REGION OF SOUTH CHINA

作　　者：孙佳佳[1,2] 于东升[1,3,2] 史学正[1,2] 顾祝军[1,4] 张文太[1,2] 杨浩[3] 

机构地区：[1]土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008 [2]中国科学院研究生院,北京100039 [3]南京师范大学地理科学学院,南京210046 [4]南京晓庄师范学院,南京210012

出　　处：《土壤学报》2010年第6期1060-1066,共7页Acta Pedologica Sinica

基　　金：国家重点基础研究发展计划“973”项目(2007CB407206);中国科学院知识创新工程项目(KSCX1-YW-09-02&01)

摘　　要：选择较合理的植被指标,对提高植被水土保持效益评价精度具有重要理论与现实意义。本研究基于福建省长汀县河田镇12个土壤侵蚀试验小区2007年和2008年2 a的降雨、径流、泥沙数据及各小区的植被叶面积指数(LAI)、植被覆盖度(VFC)资料,利用对比与统计分析方法,研究了2种植被覆盖类型(纯马尾松林、马尾松林草)和不同覆盖度(80%、60%、45%、30%、15%和5%)的红壤水土流失特点,探讨了LAI与VFC定量表征水土流失关系的稳定性和可靠性。结果表明,与裸地小区比较,马尾松纯林覆盖一定程度上降低了土壤侵蚀模数,对径流的减少作用并不明显;而马尾松林草覆盖可显著减少25%左右的径流,土壤侵蚀模数减少也在90%以上,林草结合的植被覆盖结构具有更强的水土保持功能。以LAI表征2种植被覆盖类型的土壤侵蚀模数,均能达到显著水平(p<0.05);而以VFC来表征土壤侵蚀模数,仅马尾松林草覆盖类型达到了显著水平。选择LAI表征土壤侵蚀模数来评价植被水土保持效益,将更为稳定和可靠。Choosing a more reasonable vegetation index is critical to higher precision of appraisal of soil and water conservation.In this study,an experiment of twelve plots（5m×20m） was set up on the red soil hills in Changting of Fujian Province,South China.These plots were under two types of vegetation cover（pure forest and forest-grass） separately and had six levels of vegetation coverage（80%,60%,45%,30%,15% and 5%）.Parameters of leaf area index（LAI）,vegetation fractional coverage（VFC）,rainfall,runoff and sediment were measured during the period of 2007 and 2008.Using the statistical analysis method,characteristics of soil erosion under different vegetation covers various in coverage in the region were studied,and soil erosion quantification by LAI and VFC was analyzed for stability and reliability.Results indicate that compared to the control plot,pure Pinus massoniana forest did decrease soil erosion modulus to a certain extent,but runoff insignificantly.In contrast,the mixture of forest-grass cut runoff by 25% and soil erosion modulus by up to 90%,suggesting that the vegetation fraction of forest-grass is more effective in soil and water conservation.The use of LAI to characterize soil erosion modulus under the two types of vegetation cover is able to reach the level of significance（P0.05）,while the use of VFC is but only under the forest-grass cover.Therefore,it is advisable to choose LAI to characterize soil erosion modulus to evaluate soil and water conservation for more stable and reliable results.

关 键 词：叶面积指数 植被覆盖度 植被指标 土壤侵蚀与水土保持 

分 类 号：S152.72[农业科学—土壤学]