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应用生态学报 ›› 2012, Vol. 23 ›› Issue (10): 2677-2684.

• 研究报告 • 上一篇    下一篇

土地利用方式对滇池流域土壤养分时空分布的影响

陈春瑜,和树庄**,胡斌,吕文龙   

  1. (云南大学环境科学与生态修复研究所, 昆明 650091)
  • 出版日期:2012-10-18 发布日期:2012-10-18

Effects of land use type on spatiotemporal distribution of soil nutrients in Dianchi watershed, Yunnan Province of Southwest China.

CHEN Chun-yu, HE Shu-zhuang, HU Bin, LU Wen-long   

  1. (Institute of Environmental Sciences and Ecological Restoration, Yunnan University, Kunming 650091, China)
  • Online:2012-10-18 Published:2012-10-18

摘要: 选择滇池流域6种土地利用方式(废弃大棚区、林地、坡耕地、台地、平坝菜地和设施大棚菜地)逐月定点测定表层土壤pH以及氮、磷和有机质含量,分析土地利用方式对滇池流域土壤养分时空分布的影响.结果表明: 研究区不同土地利用方式的土壤pH、有机质含量、总氮含量、总磷含量、C/N均存在显著差异.pH值依次为废弃大棚>平坝菜地>设施大棚>台地>坡耕地>林地;有机质含量依次为废弃大棚>平坝菜地>设施大棚>坡耕地>林地>台地;总氮含量依次为设施大棚>平坝菜地>废弃大棚>坡耕地>台地>林地;总磷含量依次为平坝菜地>设施大棚>废弃大棚>坡耕地>台地>林地;C/N值依次为林地>坡耕地>平坝菜地>台地>废弃大棚>设施大棚.土壤中有机质、氮、磷含量受施肥、灌溉、田间耕作及季节因素等影响.不同样点各指标的高值均出现在雨季,可能与当地追肥习惯有关.各种土地利用方式下,土壤总氮、总磷和有机质含量之间呈显著正相关.高强度利用的设施大棚和废弃大棚的土壤pH以及氮、磷、有机质含量明显异于人为扰动较小的林地和台地.

Abstract: Surface soil samples were monthly collected from six land use types (abandoned greenhouse field, forest land, sloped farmland, table land, flat vegetable land and greenhouse field) in Dianchi watershed of Yunnan to determine the soil pH and the contents of soil organic matter (OM), total nitrogen (TN), and total phosphorus (TP), aimed to understand the effects of different land use types on the spatiotemporal distribution of the soil nutrients. The soil pH, SOM, TN and TP, contents, and soil C/N differed significantly with soil land use types. The soil pH was in the order of abandoned greenhouse field > flat vegetable land > greenhouse field > table land > sloped farmland > forest land; the OM content was in the sequence of abandoned greenhouse field > flat vegetable land > greenhouse field > sloped farmland > forest land > table land; the TN content was  in the order of greenhouse field > flat vegetable land > abandoned greenhouse field > sloped farmland > table land > forest land; the TP content was  in the order of flat vegetable field > greenhouse field > abandoned greenhouse field > sloped farmland > table land > forest land; and the C/N ratio was in the sequence of forest land > sloped farmland > flat vegetable plot > table land > abandoned greenhouse field > greenhouse field. The OM, TN and TP contents were affected by fertilization, irrigation, field cultivation and season. All the test parameters had the highest values in rainy season, which could be related to the local top-dressing habits. There were significant positive correlations among the  TN, TP and OM under all the land use types. In greenhouse field and abandoned greenhouse field, due to the severe human disturbances, the soil pH and OM, TN and TP contents were obviously higher than those in forestland and table land.