摘要
为了切实保护草地生态环境,实现草畜平衡,以畜牧业大省青海省为例,利用经过GPS定位的青海省牧草地面观测资料,分析牧草产量与NOAA/AVHRR植被指数NDVI之间的关系,分类建立青海省牧草产量估算线形模型与指数模型。模型的拟合结果良好,相关系数平方(R2)超过0.67。大部分时次的地面实测值与遥感估算值所处的产量等级基本一致,模型精度可以应用于大范围的牧草产量预测。根据牧草遥感估测结果,计算分析青海天然草场的载畜能力。结果表明,青海省县级天然草地年最高载畜量基本呈南高北低的态势。南部大部分县以及北部的祁连县在100～200万只绵羊单位之间,海西州和海东大部分县在50万只绵羊单位以下。
The paper is a case study in Qinghai Province using GPS positioned grass measurement. A relationship between pasture output and Normalized Difference Vegetation Index （NDVI） for NOAA/AVHRR was analyzed using linear and exponential models for estimating pasture output for various grass types. The results of the estimating models are acceptable, since the statistical correlation coefficient square （R^2） exceeds 0.67. Given this level of precision they can reasonably be used for estimating large-scale pasture output. Based on the estimation of remote sensing pasture output, the livestock carrying capacity of natural pasture in Qinghai was calculated and analyzed. Research results show that the yearly county maximum livestock carrying capacity in the southern region of Qinghai Province exceeds that of the northern region of Qinghai Province. The livestock carrying capacities in most southern counties of Qinghai and Qilan county are about 1000000-2000000 sheep units. The livestock carrying capacities in the counties of Haixi and in most counties in Haidong are less than 500000 sheep units.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2008年第8期147-151,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
中国气象局2006年新技术推广技术项目(CMATG2006M01)
国家气象中心项目“生态气象业务技术应用研究”
关键词
牧草产量
遥感
估算模型
载畜能力
羊单位
pasture output
remote sensing
estimation model
livestock carrying capacity
sheep unit
