Temporal and Spatial Characteristics of Soil Nutrients under Different Artificial Vegetation Types in Yuzhong Basin，Gansu Province

doi:10.15933/j.cnki.1004-3268.2021.11.010

Abstract

Abstract: The characteristics of soil nutrients in Yuzhong Basin，Gansu Province，northwest semi‑arid region were studied in this project，to provide a theoretical basis for restoring and treating its fragile ecological environment.Soil samples with different depths（0—10，10—20，20—30 cm）underneath eight kinds of widely distributed plants（alfalfa，pear，ginkgo，pine，cypress，peony，rose，and clove）from four artificial vegetation types（grassland，deciduous forest，coniferous forest，and shrub） in YuzhongBasin，Gansu Province were analyzed to study time and space distribution of nutrients in the soil samples.The results showed that the nutrients of the soil samples decreased with the soil depth，which displayed the average available potassium content（130.62 mg/kg）> the average available phosphorus content（76.16 mg/kg）> the average ammonium nitrogen content（50.04 mg/kg），and the average organic matter content was 18.15 g/kg；The seasonal variation characteristics were prominent，except arganic matter the soil nutrients in spring was higher than that in winter.The pH value in different seasons and different soil layers did not change much，and maintained at 7.84—8.68，slightly alkaline.Electrical conductivity increased with the soil depth，while organic matter decreased with the soil depth.Among the eight plant sample plots，an extremely significant linear quantitative relationship existed in the alfalfa sample plots between available potassium and ammonium nitrogen，soil organic matters，electrical conductivity.Soil nutrients from other plant plots had few interactions with physical and chemical factors.In conclusion，significant differences existed in the distribution of soil nutrients in time and space，and specific synchronization existed between soil nutrients and vegetation types.

Key words: Yuzhong Basin, Soil nutrient, Plant type, Physical and chemical factor

摘要： 研究西北半干旱地区甘肃省榆中盆地的土壤养分特征，为其脆弱生态环境修复与治理提供理论依据。以甘肃省榆中盆地4种典型的人工植被类型（草地、落叶林、针叶林、灌木林）下分布较为广泛的8种植物（苜蓿、梨树、银杏、松树、柏树、牡丹、月季、丁香）样地不同深度（0～10、10～20、20～30 cm）的土壤样品为研究对象，分析不同植物覆盖下土壤养分的时间和空间特征。结果表明，不同人工植被类型下8种植物样地的土壤养分均随着土层深度的增加而减少，速效钾平均含量（130.62 mg/kg）>速效磷平均含量（76.16 mg/kg）>铵态氮平均含量（50.04 mg/kg），有机质平均含量为18.15 g/kg；且季节变化特征明显，除有机质外，春季土壤养分含量>冬季土壤养分含量。不同季节及不同土层pH值变化不大，维持在7.84~8.68，偏碱性。电导率随土壤深度增加而增加。8种植物样地，苜蓿样地土壤速效钾含量与土壤铵态氮含量、土壤有机质和土壤电导率存在极显著（P<0.01）的线性数量关系；其他植物样地的土壤养分与理化因子互作较小。综上，土壤养分在时间和空间上分布差异显著（P<0.05），土壤养分与植被类型存在一定的同步性。

关键词: 榆中盆地, 土壤养分, 植物类型, 理化因子

CLC Number:

S158

WEI Ti, BU Lei, WU Dengyu, CHEN Hongfu, GAO Dandan, LIU Honghai, XU Hongwei, CAI Yong, YANG Jutian, GUO Penghui. Temporal and Spatial Characteristics of Soil Nutrients under Different Artificial Vegetation Types in Yuzhong Basin，Gansu Province[J]. Journal of Henan Agricultural Sciences, 2021, 50(11): 79-86.

韦体, 卜磊, 吴登宇, 陈宏福, 高丹丹, 刘红海, 徐红伟, 蔡勇, 杨具田, 郭鹏辉. 甘肃省榆中盆地不同人工植被类型下的土壤养分时空特征[J]. 河南农业科学, 2021, 50(11): 79-86.

Figures/Tables 5

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