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研究了秦王川灌区耕地、果园地、荒草地3种土地利用方式下的土壤有机碳及易氧化碳、微生物量碳、水溶性有机碳。结果表明:3种土地利用方式土壤有机碳及3种活性有机碳含量均表现为耕地>果园地>荒草地。不同土地利用方式土壤活性有机碳含量均随着土层加深而递减。土壤易氧化碳、微生物量碳、水溶性有机碳分配比例为耕地>果园地>荒草地,土壤活性有机碳的分配比例随土层加深而降低。不同土地利用方式下,土壤水溶性有机碳的分配比例随土层加深表现出先上升后下降的趋势。耕地和果园地20-40cm土层与0-20cm土层相比,其土壤易氧化碳分配比例有所下降,与40-60 cm土层相比,其分配比例略有升高,而荒草地土壤易氧化碳随土层加深而小幅度下降。微生物量碳的分配比例随土层加深而下降。
The soil organic carbon, readily oxidizable carbon, microbial biomass carbon and water-soluble organic carbon under three kinds of land use such as cultivated land, orchard and grassland in Qinwangchuan irrigation area were studied. The results showed that the content of soil organic carbon and three kinds of active organic carbon of three kinds of land use systems all showed cultivated land> orchard> grassland. Soil active organic carbon content in different land use types decreased with the deepening of soil layers. The distribution ratio of soil vulnerable carbon, microbial biomass carbon and water-soluble organic carbon was arable land> orchard> wasteland, and the proportion of soil active organic carbon decreased with the deepening of soil layers. Under different land use patterns, the distribution proportion of soil water-soluble organic carbon showed the trend of first increasing and then decreasing with the deepening of soil layer. Compared with 0-20 cm soil layer, the proportion of soil vulnerable carbon dioxide in 20-40cm soil layer in farmland and orchard declined, but its distribution ratio increased slightly compared with that in 40-60 cm soil layer, Soil easily oxidized carbon with soil depth and a slight decline. The proportion of microbial biomass carbon decreased with the deepening of soil layers.