We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
渭河平原农田冬小麦土壤呼吸及其影响因素.
- Authors
张晓龙; 沈 冰; 权 全; 董 樑; 田开迪
- Abstract
Based on measurement on winter wheat soil respiration (SR), environmental and biotic factors from 2013 to 2014 in semi-humid and prone-to-drought area of Weihe Plain, this paper analyzed the characteristics of diurnal and seasonal variation of SR and influences of temperature (T), soil water content (W), gross primary productivity (GPP) and leaf area index (LAI). The results showed that the SH diurnal variation appeared as a single-peak curve ranging between 1.5 and 6.94μmol C02· m-2 · s-1, with the peak presented during 12:00-14:00. Temperature was the driving factor for the SH diurnal variation, and land surface temperature (Ts) could explain 80.9% of the temporal variation for SR. The corresponding relationship between SH and temperature showed a clockwise nearly elliptic curve. From seedling stage to winter, the SR rate of wheat showed a descending trend, and stayed at a relatively low level until regreening stage. Then the rate of SH increased rapidly and reached peak in heading stage and filling stage, but there was a descending trend in mature stage. The SR values in growth period were between 0.65 and 4.85 μmol C02 · m-2 · s-1, T,W, GPP and LAI were positively related to SR (P<0.01>. Soil temperature and soil water content were the dominant factors affecting the SR seasonal variation, and they could explain 82.6% of its variation by a compound model SR = e (a+bT5 cm+cW10 cm +dW10 cm2) which was much better than monovariant model (below 65.7%). Based on the compound model results, the average rate of wheat SH during growth period in 2013-2014 was 1.67 μmol CO2 · m-2 ·s-1.
- Publication
Yingyong Shengtai Xuebao, 2016, Vol 27, Issue 8, p2551
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.201608.024