Effects of Amendments on Physicochemical Properties and Respiration Rate of Soil from the Arid Region of Northwest China

Dianpeng Li, Jianqin Zhou, Yuxin Zhang, Tao Sun, Shuqing An and Hongtao Jia
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Dianpeng Li: Institute of Wetland Ecology, School of Life Science, Nanjing University, Nanjing 210093, China
Jianqin Zhou: College of Grassland and Environment Sciences, Xinjiang Agricultural University, Urumqi 830052, China
Yuxin Zhang: College of Grassland and Environment Sciences, Xinjiang Agricultural University, Urumqi 830052, China
Tao Sun: College of Grassland and Environment Sciences, Xinjiang Agricultural University, Urumqi 830052, China
Shuqing An: Institute of Wetland Ecology, School of Life Science, Nanjing University, Nanjing 210093, China
Hongtao Jia: College of Grassland and Environment Sciences, Xinjiang Agricultural University, Urumqi 830052, China

Sustainability, 2021, vol. 13, issue 10, 1-13

Abstract: In arid regions, decreased soil fertility has adversely affected agricultural sustainability. The effects of different amendments in alleviating these issues and increasing soil fertility remain unclear. Herein, a two-year field experiment was conducted to evaluate the properties of grey desert soil and soil respiration (SR) dynamics under six different treatment groups: biochar (BC), leonardite (LD), anionic polyacrylamide (PAM − ), cationic polyacrylamide (PAM + ) powder, anionic polyacrylamide solution in water (PAM − W), and control (CK). We observed that the BC and LD amendments significantly altered soil pH, organic matter, available nitrogen, available phosphorus, cation exchange capacity, and SR. PAM amendment increased the SR as compared to the control, except in autumn, but PAM did not affect the soil properties. SR under different amendments showed strong seasonal patterns, the highest and lowest SR rates were observed in June and January, respectively. Amendments and seasonal dynamics significantly affected SR, but no interaction was observed between these factors. Temporal variation of SR was substantially influenced by soil temperature at 15 cm of soil depth. Temperature sensitivity of SR (Q 10 ) increased with soil depth and decreased with amendment addition. SR was significantly affected by soil temperature, moisture, air temperature, and their interactions. The outcomes of this study suggested that the BC and LD amendments improved soil fertility and negated the net carbon accumulation by increasing the SR and Q 10 in arid agriculture soil.

Keywords: soil conditioner; grey desert soil; CO 2 emission; soil fertility; Q 10 (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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