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Soil respiration from fields under three crop rotation treatments and three straw retention treatments

机译：三种轮作和三种秸秆还田处理对农田土壤呼吸的影响

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Straw retention is an effective method to conserve soil water content and improve soil carbon stocks. However, how soil carbon dynamics respond to different straw retention practices remains unclear. In this study, we investigated soil respiration and soil carbon sequestration at depths of 0–100 cm. We conducted a two-year field experiment with three crop rotation treatments and three straw retention treatments in northwest China. The straw retention treatments included no straw retention (NS), retention of half the straw (HS), and retention of the total amount of straw (TS). The crop rotations treatments included winter wheat plus summer soybean (WS), winter wheat plus summer maize (WM), and winter wheat plus summer fallow (WF). Mean soil respiration rates under WS, WM, and WF treatments were 5.14, 6.53, and 5.49 μmol·m-2·s-1; and 5.67, 5.47, and 6.03 μmol·m-2·s-1 under TS, HS, and NS treatments. The mean soil water content were 15.50%, 15.57%, and 15.74% under WS, WM, and WF rotations, and 15.81%, 15.41%, and 15.50% under TS, HS, and NS treatments. The soil organic carbon (SOC) concentration was higher with increased straw retention, and lower at deeper soil depths. Mean SOC concentrations under different rotations and straw treatments of TS, HS, and NS, respectively were as follows: WS: 6.91, 6.63, 6.39 g/kg; WM: 6.90, 6.72, 6.57 g/kg; and WF: 6.49, 6.52, 6.37 g/kg. Soil temperature was the main determinant of soil respiration rates. We conclude that WS rotation resulted in lower soil respiration, WM rotation resulted in a higher soil carbon sequestration potential, and WF rotation resulted in higher soil water content. However, continued, long-term monitoring is needed to confirm the effect of rotations and straw retention on soil respiration and carbon sequestration in dryland cropping systems in northern China.
机译：保留秸秆是节省土壤水分和提高土壤碳储量的有效方法。但是，土壤碳动力学如何响应不同的秸秆截留方式仍不清楚。在这项研究中，我们调查了0-100 cm深度的土壤呼吸和土壤固碳。我们在中国西北地区进行了为期两年的田间试验，其中包括三种轮作处理和三种秸秆滞留处理。秸秆保留处理包括不保留秸秆（NS），保留一半秸秆（HS）和保留秸秆总量（TS）。轮作处理包括冬小麦加夏季大豆（WS），冬小麦加夏季玉米（WM）和冬小麦加夏季休耕（WF）。 WS，WM和WF处理下的平均土壤呼吸速率分别为5.14、6.53和5.49μmol·m -2 ·s -1 ；在TS，HS和NS处理下分别为5.67、5.47和6.03μmol·m -2 ·s -1 。在WS，WM和WF轮作下，平均土壤含水量分别为15.50％，15.57％和15.74％，在TS，HS和NS处理下，平均土壤含水量分别为15.81％，15.41％和15.50％。随着秸秆截留量的增加，土壤有机碳（SOC）浓度升高，而在更深的土壤深度处降低。 TS，HS和NS的不同旋转和秸秆处理下的平均SOC浓度分别为：WS：6.91、6.63、6.39 g / kg；重量：6.90、6.72、6.57 g / kg；和WF：6.49、6.52、6.37 g / kg。土壤温度是决定土壤呼吸速率的主要因素。我们得出的结论是，WS旋转导致土壤呼吸降低，WM旋转导致更高的土壤固碳潜力，WF旋转导致更高的土壤水分。但是，需要继续进行长期监测，以确认轮作和秸秆还田对中国北方旱地种植系统中土壤呼吸和碳固存的影响。

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