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首页> 外文期刊>土壤圈（英文版） >Changes in Soil C and N Contents and Mineralization Across a Cultivation Chronosequence of Paddy Fields in Subtropical China
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Changes in Soil C and N Contents and Mineralization Across a Cultivation Chronosequence of Paddy Fields in Subtropical China

机译：亚热带稻田耕作时序的土壤碳氮含量及矿化变化

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Dynamics of soil organic matter in a cultivation chronosequence of paddy fields were studied in subtropical China.Mineralization of soil organic matter was determined by measuring CO2 evolution from soil during 20 days of laboratory incubation. In the first 30 years of cultivation, soil organic C and N contents increased rapidly. After 30 years, 0-10 cm soil contained 19.6 g kg-1 organic C and 1.62 g kg-1 total N, with the corresponding values of 18.1 g kg-1 and 1.50 g kg-1 for 10-20 cm, and then remained stable even after 80 years of rice cultivation. During 20 days incubation the mineralization rates of organic C and N in surface soil (0-10 cm) ranged from 2.2% to 3.3% and from 2.8% to 6.7%,respectively, of organic C and total N contents. Biologically active C size generally increased with increasing soil organic C and N contents. Soil dissolved organic C decreased after cultivation of wasteland to 10 years paddy field and then increased. Soil microbial biomass C increased with number of years under cultivation, while soil microbial biomass N increased during the first 30 years of cultivation and then stabilized. After 30 years of cultivation surface soil (0-10 cm)contained 332.8 mg kg-1 of microbial biomass C and 23.85 mg kg-1 of microbial biomass N, which were 111% and 47% higher than those in soil cultivated for 3 years. It was suggested that surface soil with 30 years of rice cultivation in subtropical China would have attained a steady state of organic C content, being about 19 g kg-1.
机译：研究了亚热带中国稻田耕作时序中土壤有机质的动态变化。通过测量实验室培养20天后土壤中的CO2释放量来测定土壤有机质的矿化度。在种植的前30年中，土壤有机碳和氮含量迅速增加。 30年后，0-10厘米土壤中含有19.6 g kg-1的有机碳和1.62 g kg-1的总氮，在10-20 cm时相应的值为18.1 g kg-1和1.50 g kg-1。水稻种植80年后仍保持稳定。在培养的20天中，表层土壤（0-10厘米）中有机碳和氮的矿化率分别为有机碳和总氮含量的2.2％至3.3％和2.8％至6.7％。生物活性碳的大小通常随着土壤有机碳和氮含量的增加而增加。耕地开垦至水田10年后，土壤可溶性有机碳下降，然后上升。土壤微生物量C随耕种年限的增加而增加，而土壤微生物量N在耕种的前30年中增加，然后稳定。耕种30年后，表层土壤（0-10 cm）含有332.8 mg kg-1的微生物量C和23.85 mg kg-1的微生物量N，分别比3年耕种的土壤高111％和47％。 。有人认为，在亚热带地区种植水稻30年的表层土壤有机碳含量将达到稳定状态，约为19 g kg-1。

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