Temporal variation in soil enzyme activities after afforestation in the Loess Plateau, China
Temporal variation in soil enzyme activities after afforestation in the Loess Plateau, China
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DOI：
10.1016/j.geoderma.2016.07.018
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发表时间：
2016-11
期刊：
影响因子：
6.1
通讯作者：
C. Ren;Di Kang;J. Wu;F. Zhao;Gaihe Yang;Xinhui Han;Yongzhong Feng;Guangxin Ren
中科院分区：
文献类型：
--
作者：
C. Ren;Di Kang;J. Wu;F. Zhao;Gaihe Yang;Xinhui Han;Yongzhong Feng;Guangxin Ren
造林后土壤酶活性的时间变化对土壤质量具有重要意义。研究了造林后土壤酶活性的时间变化及其对土壤性质变化的响应。在黄土高原不同土地利用类型的样地采集不同植被生长时期的土壤样品：40年生刺槐。（RP40a），柠条（CK40a），废弃土地（AL40a），以及小米（Setaria italica）农田（FL）。测定了参与C、N、P循环和土壤含水量（SWC）、溶解有机碳（DOC）、溶解有机氮（DON）和速效磷（AP）的4种酶（过氧化氢酶、糖化酶、脲酶和碱性磷酸酶）的活性。结果表明，时间变化和土地利用对土壤SWC、DOC和DON的格局有显著影响，但对AP的影响不大。此外，土壤酶活性在6月份最高，说明不同土地利用类型土壤酶活性的时间变化存在差异，尤其是碱性磷酸酶。造林也显著提高了土壤酶活性的一致性排序。此外，非度量多维尺度分析表明，造林对4种酶活性的影响程度高于时间变化。土壤酶活性与土壤性质呈显著相关，表明土壤酶活性与土壤养分动态密切相关，尤其是DON。因此，本研究表明，土壤酶活性对农田到森林的转化有响应，因此有可能影响黄土高原的土壤质量。
Temporal variation in soil enzyme activities has important significance for soil quality after afforestation. This study investigated the temporal variation in soil enzyme activities and their response to changes in soil properties following afforestation. Soil samples were collected during different periods of vegetation growth at sites in the Loess Plateau with different land use types: 40 year-oldRobinia pseudoacaciaL. (RP40a),Caragana KorshinskiiKom (CK40a), and abandoned land (AL40a), as well as millet (Setaria italica) farmland (FL). Activities of four enzymes (catalase, saccharase, urease and alkaline phosphatase) that are involved in C, N, P cycling and soil water content (SWC), dissolved organic carbon (DOC), dissolved organic nitrogen (DON), and available phosphorus (AP) were measured. The results revealed that temporal variation and land-use have significant effects on the patterns of SWC, DOC, and DON, although not on that of AP. In addition, the activities of soil enzymes were highest in June, indicating that there are differences in the temporal variation of soil enzyme activities within a given land-use type, especially for alkaline phosphatase. The consistent ranking of soil enzyme activities was also significantly increased by afforestation. Furthermore, nonmetric multidimensional scaling analysis showed that the influence degree of afforestation on activities of the four enzymes was higher than that of temporal variation. Significant correlations between soil enzyme activities and soil properties indicated that soil enzyme activities are closely related to soil nutrients dynamics, particularly with respect to DON. The present study accordingly demonstrates that soil enzyme activities respond to farmland-to-forest conversion and hence have the potential to affect soil qualities in the Loess Plateau.