Effects of Long-term Different Fertilizations on Soil Carbon Content and Profile Distribution in Desert Cropland in Xinjiang

XIANG Jiao; WANG Zhufeng; WANG Yugang; FENG Wenting

doi:10.13870/j.cnki.stbcxb.2022.04.041

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Effects of Long-term Different Fertilizations on Soil Carbon Content and Profile Distribution in Desert Cropland in Xinjiang

更新时间：2025-03-12

- Effects of Long-term Different Fertilizations on Soil Carbon Content and Profile Distribution in Desert Cropland in Xinjiang
- Vol. 36, Issue 4, Pages: 333-341(2022)
- 作者机构：
  
  1. 中国科学院新疆生态与地理研究所, 荒漠与绿洲生态国家重点实验室,乌鲁木齐,830011
  2. 中国科学院阜康荒漠生态系统国家野外科学观测站, 新疆阜康,831505
  3. 中国科学院大学,北京,100049
  4. 4中国农业科学院农业资源与农业区划研究所,北京,100081
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.04.041
  CLC： S153.6
- Published：2022
- 稿件说明：
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XIANG Jiao, WANG Zhufeng, WANG Yugang, et al. Effects of Long-term Different Fertilizations on Soil Carbon Content and Profile Distribution in Desert Cropland in Xinjiang[J]. 2022, 36(4): 333-341.
DOI：

XIANG Jiao, WANG Zhufeng, WANG Yugang, et al. Effects of Long-term Different Fertilizations on Soil Carbon Content and Profile Distribution in Desert Cropland in Xinjiang[J]. 2022, 36(4): 333-341. DOI： 10.13870/j.cnki.stbcxb.2022.04.041.

摘要

以建于1990年的新疆阜康荒漠生态系统观测研究站的长期施肥定位试验为平台，分析了不施肥（CK）、单施化肥（化肥常规NPK和化肥高量N2P2K）、化肥配施秸秆（化肥配施秸秆常规NPKS和化肥配施秸秆高量NPKS2）和化肥配施猪粪（NPKM）对农田土壤有机碳和无机碳含量与剖面分布及有机碳热稳定性的影响。结果表明：（1）长期施肥处理提高了土壤有机碳含量，其中耕层（0—20 cm）土壤有机碳响应最敏感，化肥配施秸秆还田处理下有机碳积累高于其他处理。（2）长期施肥处理均降低土壤有机碳稳定性，表明增加的土壤有机碳并不利于碳稳定。（3）长期施肥处理降低土壤无机碳含量，其降低程度随剖面呈下降趋势，可能由于灌溉淋洗导致深层土壤无机碳的净增加。（4）尽管长期施肥促进土壤有机碳累积，但由于降低无机碳含量及其储量，最终导致土壤全碳降低，表明土壤无机碳变化对干旱区土壤碳库变化具有决定性作用。结果表明，深入理解施肥措施对干旱区盐碱土的碳影响，需要同时考虑不同深度土壤有机碳和无机碳含量的变化。

Abstract

The croplands in arid regions are characterized by saline-sodic soils

low content of soil organic carbon (SOC)

and large proportions of soil inorganic carbon (SIC). Both SOC and SIC are influenced by agricultural management. However

it remains unclear that how the stock and stability of SOC and SIC at different soil depths vary after long-term fertilizations. We investigated the vertical patterns of soil carbon (C) change and SOC stability in six fertilization treatments (e.g.

NPK

N2P2K

NPKS

NPKS2

and NPKM) in the Fukang Station for Desert Ecological Research

Chinese Academy Sciences. The results showed that:(1) The contents and stocks of SOC in the tilled layer (0-20 cm) increased after 31-year fertilizations

especially in the treatment of chemical fertilizer combined with straw returning

which could be due to high plant C inputs. (2) In addition

the thermal stability of SOC decreased in all the fertilization treatments

suggesting that increased SOC after long-termfertilizations might be vulnerable to environmental changes and would promote the transformation of soil nutrients. (3) The contents and stocks of SIC decreased in different fertilization treatments

and the decreases in SIC reduced along soil profiles

resulting in the increment of SIC to the depth of 60 cm

which might be caused by irrigation. (4) Despite the increases in SOC after the long-term fertilizations

the decreases in SIC led to the loss of soil total C

demonstrating that the changes in SIC determine the net changes in soil C in the arid regions. Overall

the results of this study suggest to estimate accurately the changes in soil C in the arid regions

we need to understand changes in both SOC and SIC and their stabilities at different soil depths.

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