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以太湖流域典型河岸带草本植物叶片及土壤为研究对象,通过比较邻近3种土地利用类型(林地、农田、村镇)植物叶片及土壤的C、N、P元素,探讨不同土地利用下河岸带植物叶片与土壤C、N、P含量和化学计量特征的变化规律。结果表明:农田河岸带土壤全磷(TP)含量显著低于林地与村镇,林地表层土壤(0~10 cm)土壤有机碳(SOC)、土壤全氮(TN)含量最高;农田植物叶片全碳(TC)、TN、TP含量显著高于林地和村镇,与土壤含量变化不一致;农田植物叶片全氮含量高,其C∶N显著低于村镇土地利用类型;农田土壤N∶P和C∶P明显高于林地和村镇,而土壤C∶N相对稳定,林地表层土壤C∶N明显高于村镇与农田。以上表明,人为干扰强度影响地表凋落物积累及表层土壤对营养元素滞留能力;植物叶片与土壤元素含量高低不一致,这与农肥中元素形态及植物、土壤对元素滞留能力有关;不同土地利用类型河岸带植物养分限制状况一致;林地表层土壤C∶N结果说明其土壤碳分解速率及氮素矿化能力偏低。
In this paper, the leaves and soils of typical riparian plants in the riparian zone of the Taihu Lake basin were studied. By comparing the C, N and P elements in the leaves and soils of three adjacent land use types (forestland, farmland and village), the effects of different land use on the riparian plant Variation of C, N and P contents and stoichiometry in leaves and soil. The results showed that the total phosphorus (TP) in farmland riparian zone was significantly lower than that in forest land and village. Soil organic carbon (SOC) and soil total nitrogen (TN) content in surface soil layer (0-10 cm) (TC), TN and TP were significantly higher than those in forest land and village, which were inconsistent with the changes of soil contents. The content of total nitrogen in farmland leaves was significantly higher than that in villages and towns. The N: P and C:P Significantly higher than the forest land and villages and towns, while soil C: N is relatively stable, C: N of forest surface soil was significantly higher than that of villages and towns. The above shows that anthropogenic disturbance affects the litterfall accumulation and surface soil retention of nutrient elements; the content of plant leaves and soil elements is inconsistent, which is related to the elemental forms in plantation and the retention of elements by plant and soil. The different land use types With the same status of plant nutrient restriction. The results of C: N in the surface soil of forest showed that the soil carbon decomposition rate and nitrogen mineralization ability were low.