Soil nutrient status of hill agro-ecosystems and recovery pattern after slash and burn agriculture (Jhum) in north-eastern India

Ramakrishnan, P. S.; Toky, O. P.

doi:10.1007/bf02377111

Cited by 136 publications

(41 citation statements)

References 7 publications

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“…So, to measure the changes in soil carbon at different sites with and without afforestation is also a surrogate method, as in the present paper. In fact, the present study observed an initial decrease in soil C after afforestation followed by a gradual increase, which is consistent with changes observed for surface soils on sites measured repeatedly over time (Jug et al 1999;Richter et al 1999) or from chronosequence studies (Aweto 1981;Ramakrishnan and Toky 1981;Zak et al 1990;Trouve et al 1994). …”

Section: Methodological Issuessupporting

confidence: 91%

Soil Carbon Changes Following Afforestation with Olga Bay Larch (Larix olgensis Henry) in Northeastern China

Wang¹,

Ouyang²,

Shao³

et al. 2006

J Integrative Plant Biology

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After converting cropland to forest, carbon is sequestered in the aggrading biomass of the new forests, but the question remains, to what extent will the former arable soil contribute as a sink for CO 2 ? Quantifying changes in soil carbon is an important consideration in the large-scale conversion of cropland to forest. Extensive field studies were undertaken to identify a number of suitable sites for comparison of soil properties under pasture and forest. The present paper describes results from a study of the effects of first rotation larch on soil carbon in seven stands in an afforestation chronosequence compared with adjacent Korean pine, pasture, and cropland. An adjacent 250-year-old natural forest was included to give information on the possible long-term changes in soil carbon in northeast China in 2004. Soil carbon initially decreased during the first 12 yr before a gradual recovery and accumulation of soil carbon occurred. The initial (0-12 yr) decrease in soil carbon was an average 1.2% per year among case studies, whereas the increase in soil carbon (12-33 yr) was 1.90% per year. Together with the carbon sequestration of forest floors, this led to total soil carbon stores of approximately 101.83 Mg/hm 2 over the 33-year chronosequence. Within the relatively short time span, carbon sequestration occurred mainly in tree biomass, whereas soil carbon stores were clearly higher in the 250-year-old plantation (184 Mg/hm 2 ). The ongoing redistribution of mineral soil carbon in the young stands and the higher soil carbon contents in the 250-year-old afforested stand suggest that nutrient-rich afforestation soils may become greater sinks for carbon (C) in the long term.Key words: afforestation; carbon sequestration; China; forest litter; mineral soil; Olga Bay larch. 2003), has been undertaken and 14.7 million hectares of cropland and 17.3 million hectares of degraded land are planned to be converted to forest over a 10-year period (Zhang 2003). Establishment of plantations on exagricultural land (afforestation) is generally recognized as a valid and potentially useful means to offset greenhouse gas emissions and is an eligible activity under Article 3.3 of the Kyoto Protcol (Paul et al. 2002).Approximately 75% of total terrestrial carbon (C) is stored in Huntington 1995). Therefore, even if afforestation only slightly affects soil C stocks at the local level, it could have a significant effect on the global C budget if enough agricultural land is converted (Low 1972;de Jong 1981;Elliott 1986;Janzen 1987; Monreal et al.1995). Following afforestation, changes inevitably occur in the quality, quantity, timing, and spatial distribution of soil C inputs (Paul et al. 2002). There are also many abiotic factors affecting the extent of the change in soil C, including site preparation, previous land use, climate, soil texture, site management, and harvesting (Paul et al. 2002).Johnson (1992) concluded that the reversion of former agricultural land to forest usually results in substantial increases in soi...

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Section: Methodological Issuessupporting

confidence: 91%

Soil Carbon Changes Following Afforestation with Olga Bay Larch (Larix olgensis Henry) in Northeastern China

Wang¹,

Ouyang²,

Shao³

et al. 2006

J Integrative Plant Biology

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“…An increase in TAP (in various forms) after burning might be due to fast mineralization of organic phosphorous present in plant biomass and quick release to inorganic forms and its higher solubility. These observations are in concordance with the findings of Ramakrishnan and Toky [47]. Forest soils normally contain organic and inorganic forms of phosphorous, most of which are unavailable to the plants.…”

Section: Physico-chemical Propertiessupporting

confidence: 92%

Soil Properties of a Tropical Savannah in the Eastern Ghats of India

Chandra¹,

Ganesan²,

Prusty³

et al. 2012

OJSS

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As an outcome of globalization and liberalization of economic policies, exploration for and mining of minerals have become one of the recent lucrative trades in India. Due to stringent environment legislations, reclamation and reforestation of the mined out sites have become obligatory. Information on distribution of nutrients before and after mining provides valuable insights while developing and executing the strategy for reclamation and revegetation of the mined out sites. Successful mine reclamation plan chiefly requires information on the soil characteristics in the area during its natural state. With this aim, investigations into spatial and temporal variations in soil nutrients and other physicochemical parameters among three proposed bauxite mine locations near Araku valley, India were conducted. Soil samples were collected every three months for two years. At each location, samples from three sites in triplicates from four successive layers (0 -5 cm, 5 -10 cm, 10 -15 cm and 15 -20 cm depth) were collected.

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“…Since micro-environmental changes occur during succession (Ramakrishnan & Toky 1981;Toky & Ramakrishnan 1983), it is reasonable to relate the phenological differences to these changes. The three distinct leafing patterns observed in the three successional fallows may be related to microclimate.…”

Section: Discussionmentioning

confidence: 99%

“…Seasonaiity exposes plants to regular and periodic changes in environmental conditions such as temperature and rainfall and phenological events are often triggered because of these changes (Longman & Jenik 1974). In successional forest environments as in north-eastern India, micro-environmental conditions change rapidly (Toky & Ramakrishnan 1983) along with drastic changes in edaphic characteristics (Ramakrishnan & Toky 1981). The shrub layer of different successional communities is therefore expected to show differences in phenology over a successional gradient, as was also noted for trees (Boojh & Ramakrishnan 1981;Shukla & Ramakrishnan 1983, 1986.…”

Section: Introductionmentioning

confidence: 97%

Phenology of the shrub strata of successional sub-tropical humid forests of north-eastern India

Baruah

Ramakrishnan

1989

Vegetatio

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The phenology of 70 shrub species occurring in 5-, 25-and 60-yr old forest fallows, developed after slash and burn agriculture in north-eastern India, was studied. The early successional shrubs were largely deciduous with predominant leaf fall during the dry winter, while late successional shrubs were evergreen and with a less pronounced leaf fall pattern; the species in the 25-yr old fallow were largely of the leaf-exchanging-evergreen type. Peak leaf production, flowering and fruiting are delayed by one month in the 60-yr old fallow. The phenological separation of the growth types in the three fallows is discussed and related to possible micro-environmental differences.

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Soil nutrient status of hill agro-ecosystems and recovery pattern after slash and burn agriculture (Jhum) in north-eastern India

Cited by 136 publications

References 7 publications

Soil Carbon Changes Following Afforestation with Olga Bay Larch (Larix olgensis Henry) in Northeastern China

Soil Carbon Changes Following Afforestation with Olga Bay Larch (Larix olgensis Henry) in Northeastern China

Soil Properties of a Tropical Savannah in the Eastern Ghats of India

Phenology of the shrub strata of successional sub-tropical humid forests of north-eastern India

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