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以钱粮湖垸为例,研究了洞庭湖退田还湖区的林地(Ⅰ)、园地(Ⅱ)、旱地(Ⅲ)、水田(Ⅳ)和荒地(Ⅴ)等不同土地利用方式下的土壤养分含量、养分库综合指数以及养分相关性。研究表明:土壤养分分布的表聚效应明显,0～50cm土层土壤有机质含量为3.40～32.32g/kg,全氮、水解氮含量为2.23～9.71g/kg、12.95～112.00mg/kg,全磷、速效磷含量为29.50～69.35g/kg、4.15～75.68mg/kg,全钾、速效钾含量为6.03～30.69g/kg、37.70～217.50mg/kg;林地土壤全氮含量最高,有机质含量最低,水田有机质、全钾及速效磷含量均最高,旱地水解氮含量最高,而荒地土壤全氮、全磷、全钾、水解氮及水解磷均最低;土壤养分库综合指数变化范围为24.33～295.93,排序为IⅣ(231.96)>IⅢ(193.46)>IⅡ(70.90)>IⅠ(59.57)>IⅤ(35.59);土壤养分要素的相关性分析结果表明,有机质与全磷、全磷与速效磷、全氮与全钾、水解氮与速效磷均呈显著正相关关系,相关系数分别为0.5760、0.5961、0.6864和0.5701。
Taking Qianlihu embankment as an example, the effects of different land use types, such as woodland (Ⅰ), garden (Ⅱ), dry land (Ⅲ), paddy field (Ⅳ) and wasteland (Ⅴ) , Nutrient pool composite index and nutrient relevance. The results showed that the surface effect of soil nutrient distribution was obvious. The content of soil organic matter in 0 ~ 50cm soil layer was 3.40 ~ 32.32g / kg, the content of total nitrogen and hydrolyzed nitrogen was 2.23 ~ 9.71g / kg, 12.95 ~ 112.00mg / kg Phosphorus and available phosphorus were 29.50-69.35g / kg and 4.15-75.68mg / kg respectively. The contents of total potassium and available potassium were 6.03-30.69g / kg and 37.70-217.50mg / kg, respectively. The contents of total nitrogen and organic matter in forest soil were the highest, The content of organic matter, total potassium and available phosphorus in paddy soil were the highest, and the content of hydrolyzed nitrogen in dry land was the highest, while the total nitrogen, total phosphorus, total potassium, hydrolyzed nitrogen and hydrolyzed phosphorus in the uncultivated land were the lowest. The comprehensive index of soil nutrient pool ranged from 24.33 ~ 295.93, and the order was IⅣ (231.96)> IⅢ (193.46)> IⅡ (70.90)> IⅠ (59.57)> IⅤ (35.59). The correlation analysis of soil nutrient elements showed that organic matter, total phosphorus, total phosphorus and available phosphorus, Total nitrogen and total potassium, hydrolyzed nitrogen and available phosphorus showed a significant positive correlation, the correlation coefficients were 0.5760, 0.5961, 0.6864 and 0.5701 respectively.