Ecological study on the dynamics of soil organic matter and its related properties in shifting cultivation systems of Northern Thailand

Funakawa, Shinya; Tanaka, Sota; Shinjyo, Hitoshi; Kaewkhongkha, Thammanoon; Hattori, T.; Yonebayashi, Koyo

doi:10.1080/00380768.1997.10414793

Cited by 31 publications

(19 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The C/N ratio of the microbial biomass of the soils from 3-SF in the RP village was higher than that in the DP village, suggesting that the microbial community of the soils in the traditional shifting cultivation system may differ from that under relatively intensive cultivation. The amounts of microbial biomass in this study were about half of those reported in the previous study (Funakawa et al 1997b). The depth at which the soil samples were collected in the previous study corresponded to the surface 0-10 cm layers while that in this study to O-S cm, which may have affected the amount of microbial biomass because, according to field observations, the soils at the O-S cm depth were drier than those at the S-lO cm depth.…”

Section: Methodssupporting

confidence: 67%

“…After the slash and burn practice, the pools started to decrease through decomposition mainly during the rainy season (Funakawa et al 1997b). This reduction persisted throughout the 3 to 5 y of fallow period, suggesting that at the initial stage of the fallow period, the input of fresh organic matter from young forest vegetation could not compensate the output from the pools due to the high rate of decomposition of organic matter.…”

Section: General Considerations About Organic Matter and Microbial Bimentioning

confidence: 99%

“…In order to analyze the soil ecological problems involved in the present cropping systems, we conducted a series of studies on the soils under shifting cultivation. In the previous report (Funakawa et al 1997b), it was reported that sources of soil organic matter seemed to decrease rapidly after the slash and burn practice. Nitrification might potentially lead to soil acidification and promote an excess loss of basic cations from the soil profile (Funakawa et al 1997b;Tanaka et al 1997).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Labile pools of organic matter and microbial biomass in the surface soils under shifting cultivation in northern Thailand

Tanaka

Funakawa

Kaewkhongkha³

et al. 1998

Soil Science and Plant Nutrition

Self Cite

View full text Add to dashboard Cite

In order to analyze the N mineralization process under shifting cultivation in northern Thailand, labile pools of soil organic matter were studied, which were considered to be the factors contributing to the N mineralization process.Organic C, (organic + NH. +)-N, and hexose-C were extracted from fresh soils in the surface 0-5 cm layers with a 0.5 M K 2 SO. solution at 110°C in an autoclave (fraction A) or at room temperature with a reciprocal shaker (fraction B), and analyzed as labile pools of organic matter. In the traditional shifting cultivation system, the content of organic C in fraction A in the fallow fields for 8 to 15 y was 3,710 mg kg-l while that in the fallow fields for 1 y and 3 to 5 y was 2,640 and 2,600 mg kg-l, respectively. A high correlation was observed between the contents of the labile pool in fraction A and total soil organic matter. The ratio of the pool in fraction A to total soil organic matter apparently remained constant through the input-output balance in the pool. The content of the labile pool in fraction B was the highest among the fields cultivated for 1 y after the slash and burn practice and it decreased in the course of the fallow period. The content of organic C was 548 mg kg-l in the fields cultivated for 1 y and 235 mg kg-l in the fallow fields for 8-15 y, respectively. There was a reverse relation between the contents of the pool in fraction B and microbial biomass. Therefore, the origin of the pool in fraction B was attributed to the microbial debris associated mainly with a decrease in the soil moisture content in the dry season. On the other hand, in the relatively intensive cultivation system, there was no significant difference in the contents of the labile pools both in fractions A and B among the land use stages, suggesting that the preservation mechanism of these pools, which was observed in the traditional cultivation system, did not operate well in the intensive system. In alternative farming systems in future, it will be essential to apply organic materials to soils to supply organic matter and to maintain the microbial biomass.

show abstract

Section: Methodssupporting

confidence: 67%

Section: General Considerations About Organic Matter and Microbial Bimentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Labile pools of organic matter and microbial biomass in the surface soils under shifting cultivation in northern Thailand

Tanaka

Funakawa

Kaewkhongkha³

et al. 1998

Soil Science and Plant Nutrition

Self Cite

View full text Add to dashboard Cite

show abstract

“…This might be due to the land-use history where the teak plantations are located. The plantation in the watershed had been used as agricultural land, which may have resulted in lower soil respiration by consumption of labile soil organic matter as often found in shifting cultivation sites 3 . Raich et al 17 reviewed that interannual variability of soil CO 2 effluxes correlated with interannual differences in precipitation in seasonally dry climate biome like our sites.…”

Section: Discussionmentioning

confidence: 99%

Soil Respiration in Different Ages of Teak Plantations in Thailand

Takahashi

Hirai

Limtong³

et al. 2009

JARQ

View full text Add to dashboard Cite

Soil respiration is a crucial carbon flux for determining carbon balance in the forest ecosystem. In Kanchanaburi, western Thailand, we measured soil respiration at different stand ages (1, 6 and 21 year-old) of teak (Tectona grandis) plantations. There were no significant differences in soil respiration among plots of different ages. Soil respiration rates showed a clear seasonal pattern of a high rate in the rainy season from April to November and a low rate in the dry season from December to March. The contribution of organic layer, roots and soil to total soil respiration was 17, 15 and 68%, respectively, in the 6 year-old teak plantation (T-Y plot). Total soil respiration rate was significantly correlated with soil water content in the 0-30 cm layer. The annual amount of CO 2 efflux from the forest floor was estimated to be 1,062-1,154 gC m -2 y -1 in the teak plantations in 1997. In 1998, annual CO 2 efflux declined to 80% of that in 1997 in the T-Y plot, probably due to low rainfall.

show abstract

“…Such nutrients are further enriched in the wet season by decomposition of the raw below-ground residues like the remaining roots, with high faunal and microbial activities, but periods of frequent heavy rains are also critical for nutrient loss by leaching and soil erosion (Araki 2001). To maintain the nutrients in intensive cultivation systems, the return of organic matter to the soils, and the use of fertilizers on the crops have recently been practiced (Funakawa et al 1997;Boonyanuphap et al 2007). …”

Section: Slash-and-burn Cultivation a Case Of Ecosystem Fertilitymentioning

confidence: 99%

Ecosystem Fertility: A new paradigm for nutrient availability to plants in the humid tropics

Yoneyama

Ohkura

Matsumoto

2015

Soil Science and Plant Nutrition

View full text Add to dashboard Cite

Ecological study on the dynamics of soil organic matter and its related properties in shifting cultivation systems of Northern Thailand

Cited by 31 publications

References 7 publications

Labile pools of organic matter and microbial biomass in the surface soils under shifting cultivation in northern Thailand

Labile pools of organic matter and microbial biomass in the surface soils under shifting cultivation in northern Thailand

Soil Respiration in Different Ages of Teak Plantations in Thailand

Ecosystem Fertility: A new paradigm for nutrient availability to plants in the humid tropics

Contact Info

Product

Resources

About