Soil Nitrogen and Carbon Are Affected by Tapping and Weed Covering in a Rubber Plantation,Clean - Soil Air Water

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Soil Nitrogen and Carbon Are Affected by Tapping and Weed Covering in a Rubber Plantation
Clean - Soil Air Water ( IF 1.5 ) Pub Date : 2022-08-16 , DOI: 10.1002/clen.202200146
Yongchuan Chen _{1,

2} , Degang Zhang ₁ , Yueye Deng ₂ , Xinhua He _{3,

4}

Affiliation

Clarifying the effects of rubber-tapping and natural growth weed cover on the variations in the concentrations of soil organic carbon (SOC) and nitrogen (N) may be beneficial to rubber plantation management via optimizing soil N and C accumulations and reducing the risk of environmental pollution due to NO₃⁻ leaching. This study aims to compare the concentrations of soil total-N, available-N, NH₄⁺-N, NO₃⁻-N, and SOC for addressing N and C variations as affected by rubber-tapping or weed covering in a 14-year-old rubber (Hevea brasiliensis cv. GT1) plantation in Xishuangbanna, southwest China. The soil samples at 0–20, 20–40, and 40–60 cm depths between July and December 2018 were examined monthly from no-rubber-tapping tree belt (NRTB) or rubber-tapping tree belt and no-rubber-tapping weed zone (NRTWZ) or rubber-tapping weed zone. The concentrations of SOC, total-N, available-N, NH₄⁺-N, and NO₃⁻-N vary with soil depths and sampling date. The average concentrations of SOC, total-N, available-N, NH₄⁺-N, and NO₃⁻-N at 0–60 cm soil depth are significantly higher for the NRTWZs than for the NRTBs. Soil total-N was positively correlated with SOC; either positive or negative relationships are found among different soil N forms. More soil available-N and NO₃⁻-N accumulate for tree growth under weed covering or no-rubber-tapping. These findings indicate that the variations in soil N and SOC concentrations should be taken into account as a part of rubber plantation management to improve soil N and C accumulations.

更新日期：2022-08-16

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