利用方式转变对水稻土活性有机碳及碳库管理指数的影响

发布时间：2018-06-18 00:48

本文选题：水稻土 + 土地利用方式转变　；参考：《土壤通报》2016年02期

【摘要】：水田改为经济林、蔬菜地是我国南方地区快速城市化过程中重要的土地利用方式的转变,可引起土壤质量的变化。以浙江省杭州市平原地区水稻田和由水稻田改成的经济林(果树、苗木和桑树)和蔬菜地(包括露天蔬菜地和大棚蔬菜地)为对象,研究了泥质田、青紫泥田和淡涂泥田等3种平原地区分布较为广泛的代表性水稻土改旱种植经济林、露天蔬菜地和大棚蔬菜地后土壤活性有机碳及碳库管理指数的变化。结果表明:水田改旱种植经济林、蔬菜地后,表层(0~15 cm)土壤有机碳明显下降,亚表层(15~30 cm)土壤有机碳轻微下降,30 cm以下土壤有机碳基本不变。与长期种植水稻的水田土壤相比,大棚蔬菜地、露天蔬菜地和经济林地表层土壤有机碳分别下降了32.4%~35.7%、28.2%~30.4%和18.3%~24.2%。种植经济林、露天蔬菜地、大棚蔬菜地后土壤活性有机碳(包括易氧化有机碳、颗粒态有机碳、轻组分有机碳、水溶性有机碳和微生物生物量碳)比长期种植水稻的水田有不同程度降低,其中易氧化有机碳、颗粒态有机碳和轻组分有机碳下降幅度大于有机碳总量;与长期种植水稻的水田土壤相比,经济林地土壤颗粒态有机碳和轻组分有机碳分别下降了31.41%~37.09%和22.72%~25.70%;露天蔬菜地土壤分别下降了45.78%~52.36%和39.50%~45.25%;大棚蔬菜地分别下降了55.44%~63.59%和45.92%~55.13%。同时,易氧化有机碳、颗粒态有机碳和轻组分有机碳占总有机碳的比例也有明显的下降趋势。改旱后土壤碳库管理指数呈明显下降,下降幅度:大棚蔬菜地露天蔬菜地经济林地。分析认为,土地利用方式改变引起有机碳矿化及有机物质输入平衡发生变化是引起土壤有机碳变化的主要原因;水田改旱不利于土壤碳库管理指数提高。
[Abstract]:The change of paddy field to economic forest, vegetable land is an important change of land use mode in the process of rapid urbanization in southern China, which can cause the change of soil quality. The muddy field was studied on paddy field, economic forest (fruit tree, seedling and mulberry tree) and vegetable field (including open vegetable field and greenhouse vegetable field) in plain area of Hangzhou City, Zhejiang Province. The changes of soil active organic carbon (SOC) and carbon pool management index in three plain areas, such as bluish purple mud field and light coated mud field, which were widely distributed in paddy land and dry planting forest, were observed in open vegetable field and greenhouse vegetable field. The results showed that the soil organic carbon decreased obviously after paddy field was changed to dry planting economic forest. After vegetable land, the soil organic carbon decreased obviously, but the subsurface layer soil organic carbon decreased slightly under 30 cm soil organic carbon. Compared with the paddy soil cultivated for a long time, the soil organic carbon in greenhouse vegetable field, open vegetable field and economic forest land decreased by 32.4% and 18.3%, respectively, and the soil organic carbon of surface soil decreased by 32.4% and 18.3%, respectively. Soil active organic carbon (including easy to oxidize organic carbon, particulate organic carbon, light organic carbon) after planting economic forest, open vegetable field, greenhouse vegetable field, Water soluble organic carbon and microbial biomass carbon) were lower than those of paddy field planted for a long time, and the decrease of easily oxidized organic carbon, particulate organic carbon and light organic carbon was larger than that of organic carbon. Compared with paddy soil planted with rice for a long time, soil particulate organic carbon and light component organic carbon in economic forest decreased 31.41%, 37.09% and 22.72% respectively, open vegetable soil decreased 45.782.36% and 39.50% respectively, and greenhouse vegetable field decreased 55.44% 63.59% and 45.92% and 55.13%, respectively. At the same time, the ratio of easily oxidized organic carbon, particulate organic carbon and light organic carbon to total organic carbon also decreased obviously. The index of soil carbon pool management decreased obviously after drought, and the decrease range was: greenhouse vegetable field, open vegetable land, economic forest land. It is concluded that the change of organic carbon mineralization and the change of organic matter input balance are the main reasons for the change of soil organic carbon, and the change of paddy field to drought is not conducive to the improvement of soil carbon pool management index.
【作者单位】：浙江省建德市农技推广中心;
【基金】：建德市耕地地力监测(编号:浙土肥字[2007]35号)资助
【分类号】：S153.6

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