本文選題：三江源 + 產(chǎn)草量��； 參考：《草業(yè)學(xué)報》2017年10期

【摘要】：三江源地區(qū)是我國重要的江河發(fā)源地,分析該地區(qū)多年草地產(chǎn)草量的時空動態(tài)變化,探討產(chǎn)草量與降水量的關(guān)系,對于在未來氣候變化情景下合理管理草地、指導(dǎo)畜牧業(yè)發(fā)展具有重要意義。利用2006-2013年MODISNDVI數(shù)據(jù)和同期442個地面采樣數(shù)據(jù),對3個草地類型分別建立NDVI與實測產(chǎn)草量之間的經(jīng)驗關(guān)系模型,并用這些模型推算2006-2013年三江源草地產(chǎn)草量的分布;同時,從三江源不同類型草地產(chǎn)草量與年降水量、不同月份降水量及不同降水累積時期的關(guān)系入手,探討三江源地區(qū)草地生產(chǎn)力如何響應(yīng)降水格局的變化。結(jié)果表明,從整個三江源地區(qū)來看:(1)2006-2013年產(chǎn)草量呈現(xiàn)增加的趨勢,不同草地類型產(chǎn)草量對年降水量變化的響應(yīng)程度不同。(2)對產(chǎn)草量影響最重要的降水月份是前一年10月,其次是當年4和5月。(3)驅(qū)動產(chǎn)草量年際變化最重要的累積降水時期是前一年的10月到當年5月。(4)前一年秋季和當年春季的累積降水量對第二年產(chǎn)草量有著至關(guān)重要的影響。
[Abstract]:The source region of the three rivers is an important source of rivers in China. The temporal and spatial dynamic changes of grassland yield in this area for many years are analyzed, and the relationship between grass yield and precipitation is discussed, and the reasonable management of grassland in the future climate change scenario is discussed. It is of great significance to guide the development of animal husbandry. Based on the MODISNDVI data from 2006 to 2013 and 442 ground sampling data from 2006 to 2013, the empirical relationship models between NDVI and measured grass yield were established for three grassland types, and the distribution of grassland yield in Sanjiangyuan grassland from 2006 to 2013 was calculated. Based on the relationship between the grass yield of different types of grassland in the source of three rivers and the annual precipitation, the precipitation in different months and the accumulative period of precipitation, the relationship between grassland productivity and the change of precipitation pattern in Sanjiangyuan area was discussed. The results showed that the grass yield of different grassland types showed an increasing trend from 2006 to 2013 in the whole Sanjiangyuan area. The most important precipitation month affecting the grass yield was October of the previous year, and the response degree of different grassland types to the annual precipitation variation was different. Secondly, the most important period of accumulated precipitation driving the interannual variation of grass yield is from October of the previous year to May of the same year.) the accumulated precipitation in autumn and spring of the year before the year has a vital influence on the yield of grass in the second year.
【作者單位】： 中國科學(xué)院地理科學(xué)與資源研究所陸地表層格局與模擬重點實驗室;中國科學(xué)院大學(xué);
【基金】：青海省科技支撐計劃項目(2015-SF-A4-1)資助
【分類號】：S812

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本文編號：1981424