摘要
【目的】探讨测定元阳梯田不同植被类型的土壤养分含量和土壤酶活性特征。【方法】在元阳梯田核心区域选取6种植被类型(鼠麹草、撑绿竹、野牡丹、杉木、旱冬瓜和樟木),按0~20 cm和20~40 cm土层进行取样,测定各土层土壤的理化性质(pH、有机碳、总氮、碱解氮、总磷、速效磷、全钾和速效钾)和土壤酶活性(蔗糖酶、脲酶、蛋白酶和过氧化氢酶),分析土壤养分和土壤酶活性间的相关性。【结果】不同植被类型土壤养分和土壤酶活性均随土层深度的增加呈现出降低的趋势,土壤养分表聚现象明显;土壤酶活性间呈现出极显著相关关系,土壤养分间呈现出显著相关和极显著相关关系;土壤碱解氮与蛋白酶、过氧化氢酶和蔗糖酶间呈极显著相关关系,与脲酶呈显著相关关系;在各植被类型0~40 cm土壤中,土壤蔗糖酶和脲酶均在杉木土壤中最高,分别为58.42、58.21 mg/g·24h,蛋白酶在旱冬瓜土壤中最高,为247.79 mg/g·h,过氧化氢酶在撑绿竹土壤中最高,为3.76 mg/g·24h。土壤有机碳含量在野牡丹土壤中最高,为24.35 g/kg,总氮和碱解氮在杉木和旱冬瓜土壤中最高,分别为2.24 g/kg和112.46 mg/kg,总磷和有效磷在旱冬瓜和鼠麹草土壤中最高,分别为0.82 g/kg和75.10 mg/kg。【结论】不同植被类型影响着土壤养分含量和土壤酶活性,且土壤养分含量和土壤酶活性呈现垂直分布特征。
【Objective】The soil nutrient contents and soil enzyme activities of different vegetation types of the Yuanyang terraces were investigated.【Method】Six vegetation types(cudweed, green bamboo, Melastoma candidum, China fir, Anlnus nepalensis, and camphor wood) were selected in the core area of the Yuanyang terraces and sampled at 0-20 cm and 20-40 cm soil layer. The physicochemical properties(pH, organic carbon, total nitrogen, alkaline nitrogen, total phosphorus, available phosphorus, total potassium and available potassium) and soil enzyme activities(sucrase, urease, protease and catalase) were determined for each soil layer, and correlations between soil nutrients and soil enzyme activities were analyzed.【Result】Soil nutrients and soil enzyme activities of different vegetation types showed a decreasing trend with the increase of soil depth, and the phenomenon of soil nutrient surface-aggregation was obvious. There were highly significant correlations between soil enzyme activities and significant and highly significant correlations between soil nutrients. There were highly significant correlations between soil alkaline nitrogen, protease, catalase and sucrase, and significant correlations with urease. In the 0-40 cm soil of each vegetation type, soil sucrase and urease were both highest in China fir soil(58.42 mg/g·24 h and 58.21 mg/g·24 h respectively), protease was highest in Anlnus nepalensis soil(247.79 mg/g·h) and catalase was highest in green bamboo soil(3.76 mg/g·24 h). Organic carbon content was highest in Melastoma candidum soil(24.35 g/kg), total and alkaline nitrogen contents were highest in Melastoma candidum and cudweed soils(2.24 g/kg and 112.46 mg/kg, respectively), and total and available phosphorus contents were highest in Anlnus nepalensis and cudweed soils(0.82 g/kg and 75.10 mg/kg, respectively).【Conclusion】Different vegetation types influence soil nutrient content and soil enzyme activity, which show vertical distribution characteristics.
作者
吴流通
张智浩
解国玲
邸雪嫣
石浩
苏友波
WU Liutong;ZHANG Zhihao;XIE Guoling;DI Xueyan;SHI Hao;SU Youbo(College of Resources and Environment,Yunnan Agricultural University,Kunming 650102,China)
出处
《广东农业科学》
CAS
2022年第3期86-95,共10页
Guangdong Agricultural Sciences
基金
国家自然科学基金(41663011)。
关键词
植被类型
土壤养分
土壤酶活性
元阳梯田
相关性分析
vegetation type
soil nutrient
soil enzyme activity
Yuanyang terrace
correlation analysis
