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Venkanna, K.
- Carbon Stocks in Major Soil Types and Land-use Systems in Semiarid Tropical Region of Southern India
Abstract Views :222 |
PDF Views:95
Authors
K. Venkanna
1,
Uttam Kumar Mandal
1,
A. J. Solomon Raju
2,
K. L. Sharma
1,
Ravikant V. Adake
1,
Pushpanjali
1,
B. Sanjeeva Reddy
1,
Rahul N. Masane
1,
K. Venkatravamma
1,
B. Peda Babu
1
Affiliations
1 Central Research Institute for Dryland Agriculture, Hyderabad 500 059, IN
2 Central Soil Salinity Research Institute, Regional Research Station, Canning Town, South 24-Parganas 743 329, IN
1 Central Research Institute for Dryland Agriculture, Hyderabad 500 059, IN
2 Central Soil Salinity Research Institute, Regional Research Station, Canning Town, South 24-Parganas 743 329, IN
Source
Current Science, Vol 106, No 4 (2014), Pagination: 604-611Abstract
The present study was conducted to study the soil organic and inorganic carbon stocks under different land-use systems in Warangal district, Andhra Pradesh, representing semiarid tropical region of India. Results indicated that Vertisols and associated soils contained greater total C stocks, followed by Inceptisols and Alfisols. The soil organic carbon (SOC) stock was highest in Alfisols (52.84 Mg ha-1) followed by Inceptisols (51.26 Mg ha-1) and Vertisols and associated soils (49.33 Mg ha-1), whereas soil inorganic carbon (SIC) stock was highest in Vertisols and associated soil (22.9 Mg ha-1) followed by Inceptisols (17.5 Mg ha-1) and Alfisols (12.4 Mg ha-1). Among the different land-use systems, total C stock was highest in forest soils followed by fodder system, paddy, maize, cotton, redgram, intercrop, chilli, pe rmanent fallow and lowest in castor system. Soil nitrogen also followed similar trend as SOC stock. Significant correlation (P < 0.05) was obtained between SOC stock and soil nitrogen with Mandal-wise annual rainfall. A surface map of soil C stock and soil N was prepared for Warangal district using kriging interpolation techniques and total C stock was estimated to 0.088 Pg out of which SOC stock was 77% and SIC stock was 23% for the district. A relationship was established between Walkey-Black Carbon and SOC estimated through dry combustion method using CN analyser and it was found that Walkley-Black carbon could recover 90% of SOC for semiarid tropical soils.Keywords
Carbon Sequestration, Forest Soils, Land-use Systems, Organic Carbon, Soil Types, Total Carbon Stocks.Full Text
- Sustaining Soil Quality, Resilience and Critical Carbon Level under Different Cropping Systems in Semi-Arid Tropical Alfisol Soils
Abstract Views :281 |
PDF Views:85
Authors
Uttam Kumar Mandal
1,
K. L. Sharma
2,
K. Venkanna
2,
Pushpanjali
2,
Ravikant V. Adake
2,
Rahul N. Masane
2,
J. V. N. S. Prasad
2,
G. Venkatesh
2,
Srinivasa Rao
2
Affiliations
1 ICAR-Central Soil Salinity Research Institute, Regional Research Station, Canning Town, South 24-Parganas 743 329, IN
2 ICAR-Central Research Institute for Dryland Agriculture, Hyderabad 500 059, IN
1 ICAR-Central Soil Salinity Research Institute, Regional Research Station, Canning Town, South 24-Parganas 743 329, IN
2 ICAR-Central Research Institute for Dryland Agriculture, Hyderabad 500 059, IN
Source
Current Science, Vol 112, No 09 (2017), Pagination: 1882-1895Abstract
Subsistence agriculture practice and a combination of harsh climate and fragile soils along with increasing demographic pressure are matters of great concern from the viewpoint of resource management and longterm sustainability in the semi-arid tropical Alfisol soils of India. In this study, soil quality index (SQI) has been computed on 190 sites of farmers' fields in southern India to evaluate the possible effect of land management practices on soil degradation and determine the critical levels of soil organic C stock to maintain a desirable SQI and also suggest appropriate management practices. In all, 26 predominant physical, chemical and biological properties of soils were studied and based on principal component analysis, moisture retention at field capacity, available soil N, available P, DTPA-extractable Zn, exchangeable sodium percentage, C-mineralization and bulk density were identified as the key indicators of the study region. SQI was also computed using four soil functions, viz. nutrient cycling, availability of water, resistance of soil to degradation, and salinity and sodicity. Soil resilience index was computed using data on substrateinduced respiration after exposing the soil to heat stress. SQI was highest under paddy followed by permanent fallow, maize, cotton, intercropping, redgram, and was lowest under castor system. Based on the results, it was observed that the soils which had higher SQI were also productive and they exhibited higher resilience capacity. An amount of 8.6 Mg ha-1 soil organic C stock per 15 cm depth was found essential to maintain soil quality and 2.2 Mg ha-1 of organic matter was needed every year to maintain this stock. On-farm participatory research trial was conducted using SQI as a tool for sustainable land-management practices.Keywords
Cropping Systems, Organic Carbon Stock, Soil Quality and Resilience, Sustainable Land Management.Full Text
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