雪被去除对川西亚高山云杉林土壤活性氮的影响

doi:10.13287/j.1001-9332.201706.027

应用生态学报 ›› 2017, Vol. 28 ›› Issue (6): 1786-1792.doi: 10.13287/j.1001-9332.201706.027

雪被去除对川西亚高山云杉林土壤活性氮的影响

李志杰^1,2, 杨万勤^1,2, 贺若阳¹, 庄丽燕¹, 杨开军¹, 刘群¹, 李婷婷¹, 徐振锋^1,2*

¹四川农业大学生态林业研究所, 四川省林业生态工程重点实验室, 成都 611130
²四川农业大学高山森林生态系统定位研究站, 长江上游生态安全协同创新中心, 成都 611130

收稿日期:2016-10-31 发布日期:2017-06-18
通讯作者: *E-mail:sicauxzf@163.com
作者简介:李志杰,男,1991年生,硕士研究生.主要从事土壤生态和森林生态研究.E-mail:sicaulizhijie@outlook.com
基金资助:
本文由国家自然科学基金项目(31570601,31570445,31500509)、国家重点研发计划项目(2016YFC0502505-03)和中国博士后科学基金项目(2014T70880)资助

Effects of snow removal on soil labile nitrogen in a subalpine spruce forest of western Sichuan, China

LI Zhi-jie^1,2, YANG Wan-qin^1,2, HE Ruo-yang¹, ZHUANG Li-yan¹, YANG Kai-jun¹, LIU Qun¹, LI Ting-ting¹, XU Zhen-feng^1,2*

¹Sichuan Province Key Laboratory of Ecological Forestry Engineering, Institute of Ecology &Forestry, Sichuan Agricultural University, Chengdu 611130, China
^{2Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yang-tze River, Long-term Research Station of Alpine Forest Ecosystems, Sichuan Agricultural University, Chengdu 611130, China}

Received:2016-10-31 Published:2017-06-18
Contact: *E-mail:sicauxzf@163.com
Supported by:
This work was supported by the National Natural Science Foundation of China (31570601, 31570445, 31500509), the National Research and Development Plan (2016YFC0502505-03), and the Post-doc Foundation Program of China (2014T70880)

摘要/Abstract

摘要： 气候变化引发的季节性雪被改变可能对高寒森林土壤氮循环产生深刻影响.以遮雪棚去除雪被,研究了雪被去除样方和对照样方在不同关键时期(雪被初期、深雪被期和雪被融化期)土壤氮库和矿化速率的变化.结果表明: 季节性雪被对土壤具有良好的保温作用,雪被去除使得5 cm深度土壤平均温度和最低温度分别降低0.33和1.17 ℃,并明显增加了土壤冻结深度和冻融循环.土壤活性氮在不同雪被时期存在显著差异.雪被去除使得冬季土壤铵态氮、硝态氮和可溶性有机氮增加38.6%、23.5%和57.3%.此外,雪被去除也促进了融化期土壤硝化和矿化速率的增加.因此,未来气候变暖引起的雪被减少可能加快川西亚高山森林冬季土壤氮循环.

Abstract: Warming-induced decrease in seasonal snow cover has a great potential to affect soil nitrogen cycle in alpine cold forest ecosystems. In this study, a wooden-shelter method was used to remove the snow accumulation. Soil nitrogen pools and mineralization rates in the snow removal and control plots were measured synchronously in three critical periods (early snow cover, deep snow cover and snow cover melting) in a subalpine spruce forest of western Sichuan, China. Seasonal snow cover kept soil from cold air temperature. Snow removal decreased average and minimum soil temperatures (5 cm) by 0.33 and 1.17 ℃, respectively. In addition, snow removal caused a positive effect on soil frost depth and freeze-thaw cycle. There was a significant dynamic in soil labile nitrogen pool among different periods. Snow removal on average increased NH₄⁺-N, NO₃^--N and dissolved organic nitrogen (DON) contents by 38.6%, 23.5% and 57.3%, respectively, over the winter. Moreover, snow removal increased soil net nitrification and mineralization rates in the snow co-ver melting period. Overall, warming-induced decrease in snow cover could stimulate winter soil nitrogen cycle of subalpine forests.

李志杰, 杨万勤, 贺若阳, 庄丽燕, 杨开军, 刘群, 李婷婷, 徐振锋. 雪被去除对川西亚高山云杉林土壤活性氮的影响[J]. 应用生态学报, 2017, 28(6): 1786-1792.

LI Zhi-jie, YANG Wan-qin, HE Ruo-yang, ZHUANG Li-yan, YANG Kai-jun, LIU Qun, LI Ting-ting, XU Zhen-feng. Effects of snow removal on soil labile nitrogen in a subalpine spruce forest of western Sichuan, China[J]. Chinese Journal of Applied Ecology, 2017, 28(6): 1786-1792.

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雪被去除对川西亚高山云杉林土壤活性氮的影响

Effects of snow removal on soil labile nitrogen in a subalpine spruce forest of western Sichuan, China

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