本文選題：免耕　切入點(diǎn)：雨養(yǎng)農(nóng)業(yè)　出處：《生態(tài)學(xué)報(bào)》2016年09期 　論文類型：期刊論文

【摘要】：在多年定位試驗(yàn)的基礎(chǔ)上,采用LI-8150-16多通道土壤碳通量測量系統(tǒng)對(duì)傳統(tǒng)耕作和免耕處理下玉米田的土壤呼吸進(jìn)行了連續(xù)觀測,以探討不同耕作措施處理下土壤呼吸對(duì)降雨的響應(yīng)。結(jié)果表明:降雨發(fā)生瞬間,土壤呼吸受應(yīng)激反應(yīng)影響迅速降低,傳統(tǒng)耕作和免耕處理下分別較降雨前降低62.9%—92.9%和35.8%—56.9%;降雨后,傳統(tǒng)耕作和免耕處理土壤呼吸的降幅范圍分別為31.5%—89.2%和15.7%—59.9%;土壤體積含水量接近于18%時(shí),傳統(tǒng)耕作下土壤呼吸比免耕下高51.8%,當(dāng)土壤體積含水量高于30%時(shí),傳統(tǒng)耕作下土壤呼吸比免耕處理下低43.0%,表明傳統(tǒng)耕作土壤呼吸更易受土壤水分的影響,波動(dòng)幅度大;傳統(tǒng)耕作處理下土壤呼吸隨土壤溫度的升高而增大,免耕處理下土壤呼吸隨土壤溫度的升高變化不明顯;土壤體積含水量較小(20%)時(shí),不同耕作處理下土壤呼吸均隨土壤含水量增加而增加,含水量較高(30%)時(shí)則均隨土壤含水量的升高而減小,兩種情況下均為免耕處理的變化速率更大;雙因子線性模型可較好地描述玉米田土壤呼吸對(duì)溫度和水分變化的響應(yīng)。
[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.
【作者單位】： 蘭州大學(xué)草地農(nóng)業(yè)科技學(xué)院草地農(nóng)業(yè)生態(tài)系統(tǒng)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：甘肅省重大科技專項(xiàng)資助項(xiàng)目(1203FKDA035) 教育部重大科技項(xiàng)目(313028);教育部長江學(xué)者創(chuàng)新團(tuán)隊(duì)項(xiàng)目(IRT13019)
【分類號(hào)】：S513;S154.1

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