四川省天然草原生产力监测方法研究

采用定点监测与路线监测、地面调查与遥感监测相结合的方法，对四川全省范围内2006-2009年连续4年的地面调查数据进行统计分析；结合MODIS植被指数（EVI）进行相关性分析，按主要的草原类型（组）分别建立草原产量的估测模型。经过反复修正和验证，应用估产模型分组、分区域对2007-2009年3年的草原产量进行测算，全省3年平均可食鲜草单产为4 752 kg/hm2，总可食鲜草产量8.39×1010 kg，折合干草2.53×1010 kg，理论载畜量29.69×106羊单位。分析表明，采用该技术和估测模型进行草原监测，监测结果基本符合各地实际，适用于省、州级草原部门开展较大范围的草原监测工作。

Monitoring method of productivity of natural grassland in Sichuan Province

The productivity of natural grassland in Sichuan Province during the period 2006-2009 was estimated by combing the field survey and remote sensing monitoring methods.This study used the vegetation index(EVI) to establish the estimation model for predicting the yield of main grassland types by many times modification and verification.This estimation model was used to assess the grassland production during 2007-2009 in Sichuan Province,and indicating that the averaged unit yield of grassland was 4 752 kg/ha,the total palatable fresh forage yield was 8.39×1010 kg(equivalent to 2.53×1010 kg hay yield),and the theoretical stocking rate was 29.69×106 sheep unit.This study further showed that the estimation yield from model was in accord to those from field survey in each region,and suggested that this model could be applied to grassland yield estimation in the large range scale in Sichuan Province.