Response of Topsoil Organic Carbon Mineralization to Litter Addition in the Revegetation Area in the Southeastern Fringe of the Tengger Desert

doi:10.7522/j.issn.1000-694X.2019.00067

Journal of Desert Research ›› 2019, Vol. 39 ›› Issue (5): 200-209.DOI: 10.7522/j.issn.1000-694X.2019.00067

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Response of Topsoil Organic Carbon Mineralization to Litter Addition in the Revegetation Area in the Southeastern Fringe of the Tengger Desert

Li Yunfei^1,2, Xie Ting^1,2, Shi Wanli³, Li Xiaojun¹

1. Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 101408, China;
3. College of Forestry, Gansu Agricultural University, Lanzhou 730070, China

Received:2019-07-02 Revised:2019-09-09 Online:2019-09-29 Published:2019-09-29

Abstract

Abstract: The mineralization of soil organic carbon is an important process that regulates the spatial and temporal pattern of soil carbon pool, balance of soil carbon budget, and nutrient availability for soil biota and plants, decomposition of plant residues and litter and releases CO₂ directly affects soil organic carbon mineralization (SOCM). SOCM process and its response to soil water content (SWC) and soil temperature (T_s) in the revegetation area of established in 1956 in the southeastern margin of the Tengger Desert were studied by different types of litter addition. The results showed that the addition of litter significantly promoted SOCM. After adding Caragana korshinskii, Artemisia ordosica litter and Eragrostis minor litter, the maximum rate of SOCM increased by 6.94, 5.17 times and 3.46 times respectively, the soil of 0-5 cm layer is 1.09, 1.55 and 1.22 times of the soil of 5-10 cm layer; the cumulative carbon release (CCR) increased by 3.73, 3.38 times and 2.34 times, and the soil of 0-5 cm layer is 1.17, 1.30 and 1.57 times of the soil of 5-10 cm layer. The effect of litter on SOCM was closely related to SWC and T_s. The average and maximum SOCM rate and CCR in 25℃ incubation were 2.21 times, 3.60 times and 2.21 times than great than those soil in 10℃, respectively. The average and maximum SOCM rate and CCR with 10% of SWC were 1.25 times, 1.20 times and 1.25 times than those with 5%. Litter organic carbon, litter nitrogen, Litter carbon to nitrogen ratio, Litter lignin to nitrogen ratio and soil organic carbon and nitrogen are the main factors affecting SOCM. The soil potential mineralizable carbon in different types litter addition was expressed as Caragana korshinskii > Artemisia ordosica > Eragrostis minor > Control. The addition of litter significantly promoted the process of SOCM and soil carbon turnover. The input of herbaceous litter during vegetation restoration was more conducive to soil carbon sequestration, and the regulation by litter on soil carbon pool attributes in combination with soil physicochemical properties and SWC and T_s.

Key words: litter, organic carbon mineralization, Tengger Desert, soil temperature, soil water contents

CLC Number:

S158.5

Li Yunfei, Xie Ting, Shi Wanli, Li Xiaojun. Response of Topsoil Organic Carbon Mineralization to Litter Addition in the Revegetation Area in the Southeastern Fringe of the Tengger Desert[J]. Journal of Desert Research, 2019, 39(5): 200-209.

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Response of Topsoil Organic Carbon Mineralization to Litter Addition in the Revegetation Area in the Southeastern Fringe of the Tengger Desert

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