黄土旱塬区免耕玉米田土壤呼吸对降雨的响应

发布时间：2018-03-15 04:13

本文选题：免耕　切入点：雨养农业　出处：《生态学报》2016年09期 　论文类型：期刊论文

【摘要】：在多年定位试验的基础上,采用LI-8150-16多通道土壤碳通量测量系统对传统耕作和免耕处理下玉米田的土壤呼吸进行了连续观测,以探讨不同耕作措施处理下土壤呼吸对降雨的响应。结果表明:降雨发生瞬间,土壤呼吸受应激反应影响迅速降低,传统耕作和免耕处理下分别较降雨前降低62.9%—92.9%和35.8%—56.9%;降雨后,传统耕作和免耕处理土壤呼吸的降幅范围分别为31.5%—89.2%和15.7%—59.9%;土壤体积含水量接近于18%时,传统耕作下土壤呼吸比免耕下高51.8%,当土壤体积含水量高于30%时,传统耕作下土壤呼吸比免耕处理下低43.0%,表明传统耕作土壤呼吸更易受土壤水分的影响,波动幅度大;传统耕作处理下土壤呼吸随土壤温度的升高而增大,免耕处理下土壤呼吸随土壤温度的升高变化不明显;土壤体积含水量较小(20%)时,不同耕作处理下土壤呼吸均随土壤含水量增加而增加,含水量较高(30%)时则均随土壤含水量的升高而减小,两种情况下均为免耕处理的变化速率更大;双因子线性模型可较好地描述玉米田土壤呼吸对温度和水分变化的响应。
[Abstract]:The soil respiration of maize field under conventional tillage and no-tillage treatment was continuously observed by LI-8150-16 multi-channel soil carbon flux measurement system on the basis of many years' location-based experiments. The response of soil respiration to rainfall under different tillage measures was studied. The results showed that the stress response of soil respiration decreased rapidly, 62.9% -92.9% and 35.8-56.9% lower under traditional tillage and no-tillage treatments, respectively, after rainfall. The decrease ranges of soil respiration under traditional tillage and no-tillage treatments were 31.5% -89.2% and 15.7% -59.9%, respectively. When the volume water content of soil was close to 18m, the soil respiration under traditional tillage was 51.8 higher than that under no-tillage, and when the volume water content of soil was higher than 30%, Soil respiration under traditional tillage was 43.0% lower than that under no-tillage, which indicated that soil respiration under traditional tillage was more affected by soil moisture and fluctuated greatly, and soil respiration increased with the increase of soil temperature under traditional tillage. Soil respiration did not change significantly with the increase of soil temperature under no-tillage treatment, and soil respiration increased with the increase of soil water content under different tillage treatments. When the water content was higher than 30%, the soil moisture content decreased with the increase of soil water content, and the rate of change was higher in both cases, and the response of soil respiration to temperature and water change in maize field could be well described by double factor linear model.
【作者单位】：兰州大学草地农业科技学院草地农业生态系统国家重点实验室;
【基金】：甘肃省重大科技专项资助项目(1203FKDA035) 教育部重大科技项目(313028);教育部长江学者创新团队项目(IRT13019)
【分类号】：S513;S154.1

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