| 西南喀斯特山区寿竹林地土壤微生物量与酶活性在不同坡位和剖面层次的分布特征 |
| 摘要点击 2956 全文点击 1273 投稿时间：2014-02-16 修订日期：2014-03-19 |
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| 中文关键词 喀斯特山地 寿竹林 坡位 土壤剖面层次 土壤微生物量 土壤酶活性 |
| 英文关键词 Karst mountain Disporopsis pernyi forest slope position soil profile soil microbial biomass soil enzyme activity |
| 作者 | 单位 | E-mail | | 秦华军 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | gzqinhj@126.com | | 何丙辉 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | hebinghui@swu.edu.cn | | 赵旋池 | 贵州省毕节市金沙县鼓场街道农业服务中心, 金沙 551800 | | | 李源 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | | | 毛文韬 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | | | 曾清平 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | |
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| 中文摘要 |
| 以重庆市梁平县城东乡云佛村寿竹（Dip）林地为研究对象，分析了不同坡位[上坡（US）、中坡（MS）、下坡（BS）]和剖面[表层（0~15 cm），底层（15~30 cm）]土壤微生物量碳、氮（SMBC、SMBN）、微生物碳熵、氮熵（qMBC、qMBN）、土壤过氧化氢酶（CAT）、碱性磷酸酶（ALK）、脲酶（URE）、蔗糖酶（INV）之间的关系. 结果表明，在不同坡位下，表层土壤SMBC、SMBN、qMBC、qMBN、CAT和INV表现为BS>MS>US，ALK呈BS>US>MS，URE呈MS>US>BS；底层土壤SMBC和qMBC呈MS>BS>US，SMBN、qMBN、CAT、ALK、URE和INV呈BS>MS>US. 在不同土壤层次下，SMBC、SMBN、CAT、ALK、URE和INV均表现为表层>底层；qMBC和qMBN表现为底层>表层. 相关分析表明，不同坡位和剖面层次土壤微生物碳氮与土壤酶活性、含水率之间均存在显著（P<0.05）或极显著（P<0.01）相关. 从回归分析得出的2个方程可知，SMBC随着土壤CAT和ALK的增加而增加，随着pH的增大而减小；SMBN则随着INV和ALK的增加而增加. |
| 英文摘要 |
| Soil microbial biomass and enzyme activity are important parameters to evaluate the quality of the soil environment. The goal of this study was to determine the influence of different slope position and section in Disporopsis pernyi forest land on the soil microbial biomass and enzyme activity in southwest Karst Mountain. In this study, we chose the Dip forest land at Yunfo village Chengdong town Liangping country Chongqing Province as the study object, to analyze the influence of three different slope positions [Up Slope(US), Middle Slope(MS), Below Slope(BS)] and two different sections-upper layer(0-15 cm) and bottom layer(15-30 cm) on the soil microbial biomass carbon (SMBC), soil microbial biomass nitrogen (SMBN), microbial carbon entropy (qMBC), microbial nitrogen entropy (qMBN), catalase(CAT), alkaline phosphatase (ALK), urease(URE), and invertase(INV). The results showed that the same trend (BS>MS>US) was found for SMBC, SMBN, qMBC, qMBN, CAT and INV of upper soil layer, while a different trend (BS>US>MS) was observed for ALK. In addition, another trend (MS>US>BS) was observed for URE. The same trend (BS>MS>US) was observed for SMBN, qMBN, CAT, ALK, URE and INV in bottom layer, but a different trend (MS>BS>US) was observed for SMBC and qMBC. The SMBC, SMBN, CAT, ALK, URE and INV manifested as upper>bottom with reduction of the section, while qMBC and qMBN showed the opposite trend. Correlation analysis indicated that there were significant (P<0.05) or highly significant (P<0.01) positive correlations among SMBC in different slope position and section, soil enzyme activity and moisture. According to the two equations of regression analysis, SMBC tended to increase with the increasing CAT and ALK, while decreased with the increasing pH. Then SMBN tended to increase with the increasing URE and INV. |
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