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Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (6): 295-303.DOI: 10.7522/j.issn.1000-694X.2022.00089

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The Spatial-temporal variance characteristic of soil organic carbon in cultivited land of Gansu Province and its influencing factors in the 40 years from 1980 to 2020

Meilan Zhang1,2(), Zengtuan Cui1(), Zhiheng Dun1, Ruihong Jia1, Yuxia Zhang1, Shiqian Guo1, Qianyi Cui3, Chenxuan Ge1, Liqun Cai4, Bo Dong5   

  1. 1.General Station of Gansu Cultivited Land Quality Construction and Protection,Lanzhou 730020,China
    2.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    3.Shenzhen Campus of Jinan University,Shenzhen 518053,Guangdong,China
    4.College of Resources and Environment,Gansu Agricultural University,Lanzhou 730070,China
    5.Institute of Dryland Agriculture,Gansu Academy of Agricultural Sciences,Lanzhou 730070,China
  • Received:2022-01-29 Revised:2022-06-01 Online:2022-11-20 Published:2023-01-09
  • Contact: Zengtuan Cui

Abstract:

Regional soil organic carbon (SOC) in the cultivated layer surveys are important in building an understanding of the global soil carbon cycle. In this paper, we estimated the organic carbon storage in Gansu Province by calculating the soil organic carbon density (SOCD) cultivated layer using soil survey data from three periods: 1980s, 2000s and 2020s in Gansu Province. The results show that: (1) the SOC storage in the cultivated layer of Gansu Province in the 1980s, 2000s and 2020s were 97.68 Tg, 109.14 Tg and 123.13 Tg, respectively, with a total carbon sequestration rate of 0.012±0.01 kg·m-2·yr-1 for a total of about 25.45 Tg in the last 40 years, which indicates that the current farm management measures are beneficial to the cultivated soil in the study area for long-term carbon sequestration. During the 40-year period, the SOC storage in the cultivated layer in the Hexi oasis irrigation area, Loess Plateau area and Longnan Hilly area showed an increasing trend, while the Gannan Plateau showed a decreasing trend. (2) From the perspective of different soil types, the rate of carbon sequestration of yellow-brown loam is the largest and that of chestnut-calcium soil is the smallest. (3) In the past 40 years, the SOC storage in the cultivated layer of Gansu Province has generally shown an overall increasing trend. The main influencing factor is the continuous increase in the amount of fertilizer application, the application of organic fertilizer and the return of straw to the field, which has increased the amount of crop return, which in turn increases the content of soil organic matter, and eventually promotes the accumulation of SOC in the cultivated layer.

Key words: soil organic carbon density, carbon storage, spatial-temporal variance characteristic, Gausu Province

CLC Number: