防护林区土壤酸碱度与矿质元素质量分数的关系分析

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AnalysisoftheRelationshipBetweenSoilpH and Mass Fraction of Mineral Elements in Shelter Forest Areas

Zhang Lingling1，Li Jing²＊ ，Du Hongzhi³ （Heilongjiang Province Aquatic Animal Resources Conservation Center，Qiqihar 161oo5，China; 2.Heilongjiang Qiqihar Wetland Nature Reserve Protection Center，Qiqihar l6loo6，China; 3.Qiqihar Branch of Heilongjiang Academy of Forestry，Qiqihar 16loo5，China）

Abstract In order to understand the relationship between soil pH and the mass fraction of mineral nutrients in the shelter forest areas，and theefects of soil pHand mineral elements onthe productivityand ecologicalfunctionof the shelter forest，the shelter forest of Dongfanghong Forest Farmin Tailai County was taken as the research area，and 30 sampling points were set up. Soil samples were collected from 0-20cmand>20-40cm soil layers. The soil pH and the massfractions of organic mater，total nitrogen，available phosphorus and available potassium，as wellas the molar mass concentrations of exchangeable calcium and exchangeable magnesium were determined，and the correlation analysis was carried out. The results showed that the pH of the test area was 6.5-7.2 that was neutral to slightly alkaline on the whole，the mass fraction of total nitrogen was 10-35g⋅kg-1 ，which had good nitrogen supply capacity. The mass fraction of available phosphorus was 10.9-15.2mg⋅kg-1 ，which was generally low. The mass fraction of available potassium was 102-115mg ⋅kg-1 ，which was moderately available. The mass molar concentrations of exchangeable calcium and exchangeable magnesium were 7.8-9.8cmol⋅kg-1 and 3.0-4.1 cmol kg-1 ，respectively，which were generally high. There was a positive correlation between pH and total nitrogen，available phosphorus，available potassium，exchangeablecalcium and exchangeable magnesium，and the corelation coefficient was 0.82-0.90 . With the increase of pH ，the mass molar concentrations of exchangeable calcium and exchangeable magnesium increase，which is beneficial to the release and absorption of calcium and magnesium.

Keywordsshelterforestarea;soil pH ;mineral nutrient elements;correlation analysis;soil improvement

土壤酸碱度与矿质营养元素含量是影响防护林区土壤质量和生态功能的重要因素。（剩余4695字）