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Effects of water and nitrogen addition on vegetation carbon pools in a semi-arid temperate steppe

期刊名称：J. For. Res.
时间：2015.7.31
页码：1-9
分类：S812[农业科学—草业科学;农业科学—畜牧学;农业科学—畜牧兽医] P457.6[天文地球—大气科学及气象学]
作者机构：[1]Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, People's Republic of China, [2]University of the Chinese Academy of Sciences,Beijing 100049, People's Republic of China, [3]Grassland Research Institute, Inner Mongolia Academy ofAgricultural & Animal Husbandry Sciences,Huhehot 010031, People's Republic of China, [4]College of Land and Environment, Shenyang AgriculturalUniversity, Shenyang 110866, People's Republic of China
相关基金：Project funding： This work was financially supported by the National Natural Science Foundation of China （Nos. 41373084, 41330528, and 41203054）, and the Special Fund for Agro-scientific Research in the Public Interest （No, 201203012）.
相关项目：土壤干湿交替与可利用氮素增加及其耦合变化对温带草地土壤呼吸及其组分的影响效应和机制

作者： Shufang Guo|Yunlong He|Congcong Cao|Zhongqing Yan|

关键词：草原植被, 区域降水, 半干旱草原, 氮沉降, 碳库, 温带, 添加浓度, 中国北方, Vegetationprecipitation , NitrogenTemperate steppecarbon pools , Increasingaddition , Interactive effect

中文摘要：

全球变化将在北中国的半干旱的草地在地区性的降水和氮(N) 免职导致增加。我们在内部蒙古在一个典型大草原通过地实验调查了植被碳(C) 水池的回答到模仿的降水和 N 免职增加。处理包括了 NH ₄ 在 0 的集中(CK ) 的没有 ₃ 增加， 5 (行，低氮) ， 10 (中间的氮， MN ) ，并且 20 (HN，高氮)(g ? 有或没有水的 m ²?a¹) 。在处理的三连续的年以后，从 2010 ～ 2012，水增加显著地没改变全部的植被 C 水池的尺寸，但是它显著地减少 root:shoot 的比率(R : S )(P ?=? 0.05 ) 相对控制。由对比， N 增加显著地增加了全部的植被 C 水池。在 LN， MN 和 HN 处理的 C 水池增加了 22， 39 和 44 ?% 分别地。MN 在 N 集中之中生产了最大的效果，尽管增加 N 的处理之间的差别不是重要的(P ?>? 0.05 ) 。N 增加显著地减少了 root:shoot 的比率(R : S )(P ?=? 0.03 ) 。然而，在植被 C 水池上没有水和 N 增加的重要交互效果。

英文摘要：

Global change will lead to increases in regional precipitation and nitrogen（N） deposition in the semi-arid grasslands of northern China. We investigated the responses of vegetation carbon（C） pools to simulated precipitation and N deposition increases through field experiments in a typical steppe in Inner Mongolia. The treatments included NH4NO3 addition at concentrations of 0（CK）, 5（LN, low nitrogen）, 10（middle nitrogen, MN）, and 20（HN,high nitrogen）（g m~（-2）a~（-1）） with and without water. After three consecutive years of treatment, from 2010 to 2012,water addition did not significantly change the size of the total vegetation C pools, but it significantly decreased the ratio of root：shoot（R：S）（P = 0.05） relative to controls. By contrast, N addition significantly increased the total vegetation C pools. The C pools in the LN, MN and HN treatments increased by 22, 39 and 44 %, respectively. MN produced the largest effect among the N concentrations,although differences between N-added treatments were not significant（P ？ 0.05）. N addition significantly reduced the ratio of root：shoot（R：S）（P = 0.03）. However, there were no significant interactive effects of water and N addition on the vegetation C pools.

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