Distribution of soil aggregate and organic carbon under different land use types in Linzhi, Tibet

doi:10.3969/j.issn.1004-1524.2019.08.17

›› 2019, Vol. 31 ›› Issue (8): 1353-1360.DOI: 10.3969/j.issn.1004-1524.2019.08.17

• Environmental Science • Previous Articles Next Articles

Distribution of soil aggregate and organic carbon under different land use types in Linzhi, Tibet

LIAN Yuzhen^1,2,3, LIU Heman⁴, CAO Lihua⁵, HAN Xiaohao⁵, MA Heping^1,2,3,*

1. Research Institute of Tibet Plateau Ecology, Tibet Agriculture & Animal Husbandry University, Linzhi 860000, China;
2. Key Laboratory of Forest Ecology in Tibet, Ministry of Education, Linzhi 860000, China;
3. National Key Station for Field Scientific Observation & Experiment, Linzhi 860000, China;
4. Xinyang Agriculture and Forestry University, Xinyang 464000, China;
5. Faculty of Resources and Environmental Science, Tibet Agriculture & Animal Husbandry University, Linzhi 860000, China;

Received:2019-04-04 Online:2019-08-25 Published:2019-08-30

Abstract

Abstract: In order to reveal the impact of land use types on soil aggregates and soil organic carbon in Linzhi, farm land (FL), vegetable greenhouse (VG), abandoned land (AL), grass land (GL) and secondary forestland (SF) of Bayi Town were selected as the research objects, dry sieving method was introduced to classify soil aggregates, and the aggregates as well as the content and distribution of soil organic carbon and labile organic carbon were explored. It was shown that soil aggregate with the size ≥2 mm constituted the majority at 0-20 cm, and its content was higher in GL and AL than that of VG and FL, indicating that the soil structure of natural ecosystem was better than agriculture land (FL and VG). The content of organic carbon and labile organic carbon in soil aggregate was higher in 0-10 cm layer than that in 10-20 cm layer, and was higher in macroaggregate (≥0.25 mm) than that in microaggregate (<0.25 mm). The aggregate with size ≥2 mm showed the highest contribution rate to organic carbon and labile organic carbon in soil aggregate, and possessed strong capacity of carbon sink. The soil structure of natural ecosystems was good, and the reclamation of GL and SF would lead to deterioration of soil structure. Protective farming measures or reducing artificial interruption to forest lands and grass lands should be carried out, to enhance the stability of soil organic carbon storage, and ensure its role as soil carbon sink.

Key words: Tibet, soil aggregates, organic carbon, labile organic carbon, land use type

CLC Number:

S152.4

LIAN Yuzhen, LIU Heman, CAO Lihua, HAN Xiaohao, MA Heping. Distribution of soil aggregate and organic carbon under different land use types in Linzhi, Tibet[J]. , 2019, 31(8): 1353-1360.

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Distribution of soil aggregate and organic carbon under different land use types in Linzhi, Tibet

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