本文選題：放牧　切入點(diǎn)：高寒草原　出處：《草業(yè)科學(xué)》2017年08期 　論文類型：期刊論文

【摘要】：以祁連山北坡高寒灌叢化草甸和高寒草原為對象,測定比較夏季、冬季和春秋季牧場的夏季土壤呼吸特征及與其影響因素之間的關(guān)系,為牧場碳匯管理提供依據(jù)。以高山灌叢化草甸為主的夏季牧場日均土壤呼吸速率(Rs)為0.26μmol·(m~2·s)~(-1),以高寒草原為主的冬季和春秋季牧場日均Rs分別為0.24和0.19μmol·(m~2·s)~(-1)。隨放牧增強(qiáng),冬季牧場Rs減小,春秋季和夏季牧場Rs增加。冬季牧場Rs與土壤含水量(soil mosture,SM)顯著正相關(guān)(P0.05),Rs與放牧率(stocking rate,SR)和土壤溫度(soil temperature,Ts)顯著負(fù)相關(guān)(P0.05);春秋季牧場Rs與SR、光合有效輻射(photosynthetically awailable radiation,PAR)、Ts顯著正相關(guān)(P0.05);春秋季牧場Rs與SM和群落蓋度(community coverage,C)顯著負(fù)相關(guān)(P0.05)。結(jié)構(gòu)模型方程表明,冬季牧場放牧率通過Ts對Rs的負(fù)向間接作用最強(qiáng),SM對Rs正向的直接作用次之;春秋季牧場群落蓋度對Rs負(fù)向直接作用最大,放牧率對Rs正向的直接作用次之。冬季牧場Rs可分別由Rs=0.436-0.012Ts+0.018SM(R2=0.911,P=0.038)和Rs=0.707+0.002SR-0.02Ts(R2=0.775,P=0.037)估測;春秋季牧場可由Rs=-0.239+0.003PAR-0.001C(R2=0.979,P=0.004)估測。
[Abstract]:Taking alpine shrub meadow and alpine steppe on the northern slope of Qilian Mountains as objects, the soil respiration characteristics in summer, winter and spring and autumn were measured and compared with the relationship between soil respiration and its influencing factors. The average soil respiration rate (Rs) in summer pasture was 0.26 渭 mol 路m ~ (2) 路s ~ (-1). The average daily Rs in winter and spring / autumn pasture were 0.24 and 0.19 渭 mol 路m ~ (2 路s) 路s ~ (-1) respectively. In spring, autumn and summer, there was a significant positive correlation between Rangeland RS and soil moisture content and soil moisture content (SMMC). There was a significant negative correlation between RS and stocking rate (SRs) and soil temperature temperatureTs (P 0.05), while in Spring and Autumn Rangeland, photosynthetically effective awailable radiations (photosynthetically awailable radiations) and PARTs were significantly positive. There was a significant negative correlation between RS and SM and community coverageC0. 05 in spring and autumn. The structural model equation showed that, In winter grazing rate had the strongest negative indirect effect on Rs, and SM had the second direct effect on Rs, and the coverage of pasture community in spring and autumn had the most negative direct effect on Rs. The direct effect of grazing rate on Rs was the second. In winter, RS could be estimated by Rs=0.436-0.012Ts 0.018SM-R20.911P0. 038) and Rs=0.707 0.002SR-0.02Ts1 / R2 (0.775P0. 0377); in spring and autumn pasture, it could be estimated by Rs=-0.239 0.003PAR-0.001CR20.979P0.004).
【作者單位】： 草地農(nóng)業(yè)生態(tài)系統(tǒng)國家重點(diǎn)實(shí)驗(yàn)室蘭州大學(xué)草地農(nóng)業(yè)科技學(xué)院;農(nóng)業(yè)部草牧業(yè)創(chuàng)新重點(diǎn)實(shí)驗(yàn)室;
【基金】：教育部“創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃”(IRT 17R50) 國家科技支撐計(jì)劃項(xiàng)目(2012BAD13B05)
【分類號】：S812.2

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