祁连县天然草地地上生物量及草畜平衡研究

论文利用2013—2014年的MOD13Q1数据、草地地上生物量鲜重实测数据、多年降水数据和统计年鉴数据,建立了祁连县草地地上生物量与牧草鲜重的遥感监测模型以及不同季节放牧草场的理论载畜量模型,分析了天然草地草产量年内动态变化与载畜量平衡状况并对草畜调控进行模拟。结果表明：MODIS增强型植被指数EVI的指数函数可以较好地模拟祁连县草地地上生物量鲜重,精度达到71%;年内牧草生长呈单峰曲线,7月草地可食产量达到峰值2 322.61 kg/hm~2,12月最低,为702.06 kg/hm~2;祁连县冷暖季平均可食鲜草产量分别为1 728.14和1 604.70 kg/hm~2,年可食鲜草总量分别...

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Published in自然资源学报 Vol. 32; no. 7; pp. 1183 - 1192
Main Author 张福平 王虎威 朱艺文 张枝枝 李肖娟
Format Journal Article
LanguageChinese
Published 陕西师范大学地理科学与旅游学院,西安710119 2017
地理学国家级实验教学示范中心(陕西师范大学),西安710119
Subjects
天然草地
生物量
祁连县
草畜平衡
biomass
生物量
草畜平衡
Qilian County
天然草地
祁连县
balance between forage and livestock
grassland
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ISSN1000-3037
DOI10.11849/zrzyxb.20160770

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Summary:论文利用2013—2014年的MOD13Q1数据、草地地上生物量鲜重实测数据、多年降水数据和统计年鉴数据,建立了祁连县草地地上生物量与牧草鲜重的遥感监测模型以及不同季节放牧草场的理论载畜量模型,分析了天然草地草产量年内动态变化与载畜量平衡状况并对草畜调控进行模拟。结果表明：MODIS增强型植被指数EVI的指数函数可以较好地模拟祁连县草地地上生物量鲜重,精度达到71%;年内牧草生长呈单峰曲线,7月草地可食产量达到峰值2 322.61 kg/hm~2,12月最低,为702.06 kg/hm~2;祁连县冷暖季平均可食鲜草产量分别为1 728.14和1 604.70 kg/hm~2,年可食鲜草总量分别达到7.74×10~8和7.82×10~8kg;暖季、冷季和全年的理论载畜量分别为1.517 8、0.637 0和0.931 4羊单位/hm~2,暖季、冷季和全年的超载率分别为101.70%、261.19%和149.22%;保持现有的家畜数量,需在暖季草场和冷季草场分别补饲牧草0.36×10~8和7.17×10~8kg;保持现有草场,则暖季草场和冷季草场分别需要减6.68×10~4和53.64×10~4羊单位;暖季不进行补饲,冷季草场家畜在减少40%的情况下,依旧需要补饲1.17×10~8kg。
Bibliography:By use of statistical yearbook data, years precipitation data, grassland investigation data and MOD13Q1 during 2013-2014 in Qilian County, the models of monitoring grassland aboveground biomass（GAB） and theoretic livestock carrying capacity in different grazing seasons were established. Changes of available grassland yield and livestock carrying capacity were analyzed. Results suggested that the exponential function of MODIS-EVI（Enhanced Vegetation Index） can best simulate the green yield of GAB in Qilian. The average precision of the monitoring model was 71.0%. The monthly dynamic growth of forage during the year was featured by a unimodal curve. The edible grass yield reached a peak of 2 322.61 kg/hm~2 in July,and got to the lowest of 702.06 kg/hm~2 in December. Average green yields in cold and warm seasons were 1 728.14 and 1 604.7 kg/hm~2, respectively. The total available green forage yield in Qilian County were 15.56×10~8 kg, in which warm seasonal grazing rangeland was 7.74×10~8kg, cool seasonal grazin
ISSN:1000-3037
DOI:10.11849/zrzyxb.20160770