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Carbon cycling and balance in a traditional cardamom based agroforestry system of Sikkim Himalayas
Tropical Ecology ( IF 1.6 ) Pub Date : 2020-09-18 , DOI: 10.1007/s42965-020-00110-9
Nima Tshering Lepcha , N. Bijayalaxmi Devi

The pattern of carbon cycling dynamics in a 20 year old traditional cardamom agroforestry system located at Sikkim Himalaya was studied for two years to understand the dynamics of different carbon pools and carbon emission patterns in the system. Total biomass (aboveground + belowground) and carbon in trees were 81.91 ± 9.04 Mg ha−1 and 38.47 ± 4.25 Mg C ha−1, respectively and contributed 27% of the total ecosystem carbon. Herbs and detritus carbon were 2.34 ± 0.24 Mg C ha−1 and 3.64 ± 0.20 Mg C ha−1 respectively while cumulative soil organic carbon (SOC) stock ranged from 89.90 ± 2.16 (January) to 117.91 ± 3.12 Mg C ha−1(August) in the 0–45 cm soil layer. Seasonal microbial biomass carbon (MBC) stock varied from 501.34 to 857.77 µg g−1 while annual CO2 emission (SR) ranged from 112.11–219.29 mg CO2 m−2 h−1. SOC, MBC and SR exhibited strong seasonality with a peak value in rainy and least in the winter season. Carbon density of trees exhibited a positive and significant relation with tree density (P < 0.05), basal area (P < 0.01) and aboveground biomass (P < 0.01). All the abiotic variables with the exception of bulk density and soil pH showed strong positive and significant relationship with SOC, MBC and SR. Total carbon sequestration of 11.91 Mg C ha−1 year−1 and release of 3.46 Mg C ha−1year−1 resulting to a net ecosystem carbon balance of 8.45 Mg C ha−1 year−1 by a traditional agroforestry system suggests that besides provision of livelihood opportunities it can be used as an adaptation strategy in agricultural systems for mitigation of climate change.



中文翻译:

锡金喜马拉雅山基于传统豆蔻的农林业系统中的碳循环和平衡

研究了位于锡金喜马拉雅山的具有20年历史的传统豆蔻农林业系统中的碳循环动力学模式,为期两年,以了解系统中不同碳库的动态和碳排放模式。树木总生物量(地上+地下)和碳分别为81.91±9.04 Mg ha -1和38.47±4.25 Mg C ha -1,占生态系统总碳的27%。草药和碎屑碳分别为2.34±0.24 Mg C ha -1和3.64±0.20 Mg C ha -1,而累积土壤有机碳(SOC)范围为89.90±2.16(一月)至117.91±3.12 Mg C ha -1(八月)在0-45厘米的土壤层中。季节性微生物生物量碳(MBC)储量在501.34至857.77 µg g -1之间,而年度CO 2排放量(SR)在112.11–219.29 mg CO 2 m -2  h -1之间。SOC,MBC和SR表现出强烈的季节性,在雨季达到峰值,而在冬季最少。树木的碳密度与树木密度(P <0.05),基础面积(P <0.01)和地上生物量(P <0.01)呈正相关关系。除容重和土壤pH值外,所有非生物变量均与SOC,MBC和SR呈强正相关关系。总碳固存量为11.91 Mg C ha - 1-1并释放了3.46 Mg C ha - 1-1的碳,导致传统农林系统的生态系统净碳平衡为8.45 Mg C ha - 1-1,这表明,除了提供生计机会外,它还可以用作适应性策略。缓解气候变化的农业系统。

更新日期:2020-09-20
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