太行山低山丘陵区不同人工林型对土壤性质及酶活性的影响

发布时间：2018-03-24 01:10

本文选题：土壤脲酶　切入点：蔗糖酶活性　出处：《干旱区资源与环境》2017年10期

【摘要】：为探明太行山干旱低山丘陵区不同人工林型对土壤酶活性及土壤质量修复的影响,以立地条件一致的3种典型32年生人工林为试验样地,对栓皮栎(Quercus variabilis)、侧柏(Platycladus orientalis)和刺槐(Robinia pseudoacacia)3种不同人工林型下土壤的脲酶(Urease)和蔗糖酶(Sucrase)活性进行了测定,并比较了不同林型下土壤的理化和生物学性质。研究结果表明:1)林分类型对土壤脲酶、蔗糖酶活性有明显的影响,不同林分类型下土壤脲酶、蔗糖酶活性均呈现侧柏刺槐栓皮栎的变化趋势;2)各林地土壤含水率较低,土壤呈弱碱性。3种林地类型中,侧柏林地对土壤的改良效果较好,土壤容重和土壤pH值都显著降低,且土壤总孔隙度、全氮(TN)和有机碳(TOC)含量均显著增加(P0.05)。此外,侧柏人工林根长密度、根表面积密度和根体积密度均显著高于栓皮栎和刺槐林(P0.05);3)土壤酶活性的高低与土壤性质有较强的相关性。线性回归分析表明,土壤碱解氮、含水率和速效磷是影响脲酶活性的主要因素,而蔗糖酶活性主要受土壤有机碳含量的影响。综合分析表明,太行山干旱低山丘陵区侧柏人工林的种植有利于提高土壤酶活性和土壤质量,在该区人工林培育及植被恢复过程中可适当扩大侧柏人工林的育林面积。
[Abstract]:In order to find out the effect of different artificial forest types on soil enzyme activity and soil quality restoration in arid hilly area of Taihang Mountain, three typical 32 year old plantations with consistent site conditions were used as experimental plots. The activities of urease Ureasease (Ureaseas) and sucrase (Sucrase) in soils of Quercus variabilis, Platycladus orientalisus and Robinia pseudoacacia)3 were determined. The physicochemical and biological properties of soil under different forest types were compared. The results showed that the soil urease and sucrase activity were significantly affected by different stand types. Sucrase activity showed the changing trend of P. orientalis. (2) the soil moisture content was lower in each forest land. Among the three types of woodland with weak alkalinity, Platycladus orientalis forest had a better effect on soil improvement, and soil bulk density and soil pH value decreased significantly. The soil total porosity, total nitrogen (TNN) and organic carbon (TOC) contents increased significantly (P 0.05). In addition, the root length density of Platycladus orientalis plantation was significantly increased. The root surface area density and root volume density were significantly higher than those of Quercus variabilis and Robinia pseudoacacia (P0.05T3) soil enzyme activity was significantly correlated with soil properties. Linear regression analysis showed that soil alkali-hydrolyzed nitrogen was higher than that of Quercus variabilis and Robinia pseudoacacia. Moisture content and available phosphorus were the main factors affecting urease activity, while sucrase activity was mainly affected by soil organic carbon content. The planting of Platycladus orientalis plantation in the arid hilly area of Taihang Mountain was beneficial to improve the soil enzyme activity and soil quality. The plantation area of Platycladus orientalis plantation could be expanded in the process of plantation and vegetation restoration.
【作者单位】：河南农业大学林学院;
【基金】：国家自然科学基金项目(41501331);国家自然科学基金面上项目(31570613)资助
【分类号】：S714

【相似文献】