| 黄土丘陵沟壑区不同退耕年限刺槐林地土壤氮素动态特征 |
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| 引用本文： | 邓娜,王红雷,胡澍,吴多洋,寇萌,焦菊英.黄土丘陵沟壑区不同退耕年限刺槐林地土壤氮素动态特征[J].干旱区地理,2018,41(6):1285-1294. |
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| 作者姓名： | 邓娜 王红雷 胡澍 吴多洋 寇萌 焦菊英 |
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| 作者单位： | 1.西北农林科技大学水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨陵 712100;2.中国科学院水利部水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨陵 712100 |
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| 基金项目： | 陕西省自然科学基金（2017JQ4022） |
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| 摘 要： | 土壤无机氮的可利用性是影响植物生长发育和植被演替进程的关键因子之一，尤其在生态系统十分脆弱的黄土丘陵沟壑区更为重要。因此，采用时空代换法，通过选取不同退耕年限（10 a、20 a、30 a、40 a）的刺槐林地及相邻对照草地为研究对象，系统研究刺槐林在生长季（4~9月）土壤无机氮净转化速率的变化情况。结果表明：（1）刺槐林地土壤NO3--N平均含量约是对照草地的4.57倍，而NH4+-N在两个样地之间没有显著差异。（2）刺槐林地及对照草地土壤在7~8月以硝化作用为主，在4~5月和8~9月以氨化过程为主，且刺槐林地氮素净转化速率大于对照样地。（3）刺槐林地土壤NO3--N在前30 a处于积累状态，随后呈现消耗趋势。总而言之，退耕地刺槐林营造可以减少土壤NO3--N的淋失，提高NO3--N净转化速率，但刺槐林NO3--N的累积状态在30 a后变为消耗状态。所以要采取应对30 a以上林龄的刺槐林采取间伐措施，以促进刺槐林的健康发展。
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| 关 键 词： | 植被恢复 刺槐 无机氮 净转化速率 |
| 收稿时间： | 2018-07-21 |
Soil nitrogen dynamics of Robinia pseudoacacia within artificial revegetation process in Loess Plateau |
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| DENG Na,WANG Hong-lei,HU Shu,WU Duo-yang,KOU Meng,JIAO Ju-ying.Soil nitrogen dynamics of Robinia pseudoacacia within artificial revegetation process in Loess Plateau[J].Arid Land Geography,2018,41(6):1285-1294. |
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| Authors: | DENG Na WANG Hong-lei HU Shu WU Duo-yang KOU Meng JIAO Ju-ying |
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| Affiliation: | 1.Institute of Soil and Water Conservation, Northwest A & F University, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling 712100, Shaanxi, China;2.Institute of Soil and Water Conservation, CAS and Ministry of Water Resources, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling 712100, Shaanxi, China |
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| Abstract: | Inorganic nitrogen is one of the major nutrients in plant growth,especially in artificial revegetation. Robinia pseudoacacia plantation were considered one of the primary and promising trees of artificial revegetation in the Loess Plateau due to its fast growth and ability of fixing atmospheric nitrogen.However,the main form,net transformation rates and dynamics of inorganic nitrogen of Robinia pseudoacacia in the Loess Plateau were still unknown.In this study,we aimed to expose the capability of offering nitrogen through inorganic nitrogen.A chronosequence from 10~40 year-old plantations and adjacent contrasting grasslands in natural control with similar age were selected.The result showed as follows:(1) the average content of NO3--N was the 4.57 times in Robinia pseudoacacia plantation than that in the contrasting grasslands,but no influence on NH4+-N. (2) compared with lands and abandoned years,the soil moisture and temperature were the major effects on net transformation rates,showing nitrification was the prominent nitrogen transformation processes on July-August,while ammonization was the key nitrogen transformation processes on April-May and August-September,and Robinia pseudoacacia plantations had faster net nitrogen transformation rates than the contrasting grasslands. (3) Robinia pseudoacacia plantations can accelerate the accumulation of NO3--N compared with the grasslands,but a consumption was occurred exceeding 30 year-old.Overall,Robinia pseudoacacia plantation can reduce NO3--N leaching,but no influence on NH4+-N,and Robinia pseudoacacia plantation had a consumption trend of NO3--N after 30 years.So,some management,such as thinning,should be taken to accelerate the healthy development of Robinia pseudoacacia plantation in the Loess Plateau. |
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| Keywords: | vegetation restoration Robinia pseudoacacia inorganic nitrogen net transformation rate |
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