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当前位置: 首页 > 文章 > 古浪县草原区植被盖度及生产力评价 中国草地学报 2016,38 (3) 42-49+100
Position: Home > Articles > Evaluation of Vegetation Coverage and Productivity in Steppe in Gulang County Chinese Journal of Grassland 2016,38 (3) 42-49+100

古浪县草原区植被盖度及生产力评价

作  者：
俞慧云;陈本建;俞联平
单  位：
甘肃农业大学草业学院;甘肃省草原技术推广总站
关键词：
古浪县;温性草原;温性荒漠草原;植被盖度(FVC);草地生产力
摘  要：
将3S技术与地面调查相结合,以1991、2001、2006、2013和2014年度TM影像为数据源,结合研究区平均湿润度、≥0℃积温以及高程、坡度、坡向等指标和参数,采用决策树分类、像元二分模型和回归分析模型,分别对古浪县天然草原资源、境内温性草原和温性荒漠草原等草原区的植被盖度(FVC)及生产力进行研究与评价。结果表明,古浪县总草原面积22.41万hm2,其中高寒草甸、山地草甸、温性草原、温性荒漠和温性荒漠草原分别占1.68%、1.66%、32.55%、24.02%和40.08%。正常年景温性草原和温性荒漠草原植被盖度以Ⅲ级(40%≤FVC<60%)为主,雨量充沛年份向Ⅱ级(60%≤FVC<80%)过渡,且近10年FVC整体呈现逐步改善趋势。古浪县温性草原和温性荒漠草原平均鲜草产量分别为1042.70kg/hm2和909.34kg/hm2,均以500~1000kg/hm2鲜草产量草地所占面积较大,分别占各自草原面积的50.01%和66.32%,其次为1000~1500kg/hm2草地,分别占各自草原面积的41.87%和19.84%。全县温性草原和温性荒漠草原分别可承载3.65和3.91万个羊单位。
译  名：
Evaluation of Vegetation Coverage and Productivity in Steppe in Gulang County
作  者：
YU Hui-yun;CHEN Ben-jian;YU Lian-ping;Pratacultural College,Gansu Agricultural University;Grassland Technical Extension Station of Gansu Province;
关键词：
Gulang County,Temperate steppe,Temperate desert steppe,Vegetation coverage(FVC),Grassland productivity
摘  要：
Using"3S"technique combined with ground survey,based on the data resource of TM image in 1991,2001,2006,2013 and 2014,and combined with the average moisture,≥0℃accumulated temperature,elevation,slope,aspect.etc.,the natural grassland resource,vegetation coverage and productivity of temperate steppe and temperate desert steppe were evaluated respectively with decision tree classification,dimidiate pixel model and regression analysis model.The results showed that the total grassland area in Gulang County was 224100hm2,alpine meadow,mountain meadow,temperate steppe,temperate desert and temperate desert steppe accounted for 1.68%,1.66%,32.55%,24.02%and 40.08%,respectively.The vegetation coverage of warm steppe and temperate desert steppe distributed mainly in classⅢ(40%≤FVC<60%),transition from classⅢ to classⅡ(60%≤FVC<80%)in rainy years,also with a trend of gradual improvement of FVC in recent ten years.The forage yield of temperate steppe and temperate desert steppe were 1042.70 and 909.34kg/hm2 in average.The area of grassland with the yield 500-1000kg/hm2 was the largest,which accounted for 50.01% and 66.32% of each area,followed by 1000-1500kg/hm2 which accounted for 41.87%and 19.84%.Temperate steppe and temperate desert steppe can carry 36500 and 39100sheep-unit respectively in Gulang.

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