期刊
ARCHIVES OF AGRONOMY AND SOIL SCIENCE
卷 67, 期 7, 页码 987-1001出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/03650340.2020.1771316
关键词
Tea plantations; chronosequence; soil aggregates; organic matters; microorganisms
资金
- National Natural Science Foundation of China [31460196]
- Innovation Project of Guangxi Graduate Education [YCSW2020022]
- Natural Science Foundation of Guangxi [2019GXNSFBA185012]
The age of tea planting affects the accumulation of organic carbon and nitrogen in soil aggregates. The microbial biomass and activity in soil aggregates reach their highest levels after 17 years of tea plantation, but gradually decrease afterwards.
Improved knowledge of how tea planting age impacts the relationships of soil aggregates with microbial biomass and activity may help understand the mechanisms of improving soil organic matters (OM) sequestration in tea plantation ecosystem. In this study, soil samples (0-20 cm depth) were collected from tea plantations with various ages (8, 17, 25 and 43 years) in the southern Guangxi, China. Soil samples were split into > 2, 2-1, 1-0.25 and < 0.25 mm aggregates following an optimal moisture sieving procedure. Long-term tea planting was favorable to C(org)and N(t)accumulation in soil aggregates. However, soil aggregate-related microbial biomass (C(mic)and N(mic)contents) and activity (respiration rate) first increased and then decreased, and their levels were highest in the 17-year tea plantations. After 17 years of tea planting, the disintegration of > 2 mm fractions in soils might partially explain the decreases of microbial biomass and activity. Meanwhile, soil OM availability and soil acidification were also important drivers of the changes in soil microbial biomass and activity during tea planting. Hence, implementing a sustainable management scheme is critical to maintaining microbial community development after 17 years of tea planting, and thus favor nutrient cycling and energy flow in soils.
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