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Impact of 28 year old agroforestry systems on soil carbon dynamics in Eastern Himalayas

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Title Impact of 28 year old agroforestry systems on soil carbon dynamics in Eastern Himalayas
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Creator Gulab Singh Yadav, B.K. Kandpal, Anup Das, Subhash Babu, K.P. Mohapatra, A. Gangarani Devi, H. Lembisana Devi, Puran Chandra, Raghavendra Singh, K. K. Barman
 
Subject Agroforestry, Land restoration, Multipurpose trees, Pineapple, Soil carbon pool
 
Description Not Available
Globally, various estimates are available on the above-ground (plant parts) carbon (C) sequestering potential of
agroforestry systems (AFSs). However, information on soil organic carbon (SOC) sequestration potential is
limited for AFSs. Furthermore, the impacts of AFSs established for the restoration of C in degraded soils (prone to soil erosion, C and nutrients loss, etc.) of Himalayas are rarely investigated. Thus, a study was conducted on an agroforestry block established in 1989 at the Indian Council of Agricultural Research (ICAR), Research Complex for North Eastern Hill (NEH) Region, Lembucherra, Tripura, India. The AFSs comprised of four multipurpose tree species viz., teak (Tectona grandis Linn), sissoo (Dalbergia sissoo Roxb. Ex DC.), eucalyptus (Eucalyptus globulus L.), and neem (Azadirachta indica A. Juss) in combination with pineapple (Ananas comosus L. merr.). Planted in three times replicated randomized block design. After 28 years of establishment, the impacts of these AFSs were assessed on SOC stocks and its fraction pools. Results revealed that sissoo + pineapple system stored the highest SOC stocks in 0–15 cm (22.1 ± 1.4 Mg/ha) and 30–60 cm (18.0 ± 4.3 Mg/ha) depths, whereas the SOC stocks in 15–30 cm (12.2 ± 1.2 Mg/ha) and 0–30 cm (34.0 ± 1.6 Mg/ha) were the highest under teak + pineapple. When considering the entire 0–100 cm soil profile, the SOC stocks ranged between 65.3 and 71.6 Mg/ha across the diverse AFSs which was significantly higher than that under cultivated land (52.8 ± 2.6 Mg/ha). The sissoo + pineapple system had the highest SOC stock in 0–100 cm (71.6 ± 5.8 Mg/ha). The share of passive carbon (PC, less labile + non-labile) pools to SOC stocks under AFSs followed the order of sissoo + pineapple > teak + pineapple > neem + pineapple > eucalyptus + pineapple. The PC or recalcitrant pools of SOC stocks at 0–100 cm were 54.2–60.6% under various AFSs. Results revealed that the establishment of AFSs with pineapple on degraded lands increased a significant amount of C and had a considerable effect on soil quality in comparison to C present in soils under cropland. Thus, a large scale adoption of AFSs may restore C lost through the cultivation of the crop in degraded lands and provide a feasible option for livelihood through concurrent cultivation of multipurpose tree species and agri-horticulture crops.
National Mission on Sustaining Himalayan Ecosystem (TF-6), Department of Science & Technology, Government of India, and ICAR Research Complex for NEH Region, Meghalaya
 
Date 2022-04-05T08:46:43Z
2022-04-05T08:46:43Z
2021-01-09
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/71192
 
Language English
 
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Publisher Not Available