水氮胁迫对长白山阔叶红松林优势树种水分利用的影响

doi:10.13287/j.1001-9332.202101.030

应用生态学报 ›› 2021, Vol. 32 ›› Issue (1): 39-45.doi: 10.13287/j.1001-9332.202101.030

水氮胁迫对长白山阔叶红松林优势树种水分利用的影响

赵松实¹, 林茂森^1*, 王安志^2,3, 杨国范¹, 袁凤辉^2,3, 关德新^2,3

¹沈阳农业大学, 沈阳 110866;
²中国科学院沈阳应用生态研究所, 沈阳 110016;
³中国科学院森林生态与管理重点实验室, 沈阳 110016

收稿日期:2020-07-31 接受日期:2020-11-16 出版日期:2021-01-15 发布日期:2021-07-15
通讯作者: * E-mail: lmsen2007@126.com
作者简介:赵松实,男,1996年生,硕士研究生。主要从事生态水文学研究。E-mail: zhaoss1996@126.com
基金资助:
国家自然科学基金项目(41807172,41975150)

Effects of water and nitrogen stress on water utilization of dominant species in broadleaved Korean pine forest in Changbai Mountain, China

ZHAO Song-shi¹, LIN Mao-sen^1*, WANG An-zhi^2,3, YANG Guo-fan¹, YUAN Feng-hui^2,3, GUAN De-xin^2,3

¹Shenyang Agricultural University, Shenyang 110866, China;
²Institute of Applied Ecology, Chinese Academy of Sciences, Shen-yang 110016, China;
³Key Laboratory of Forest Ecology and Management, Chinese Academy of Sciences, Shenyang 110016, China

Received:2020-07-31 Accepted:2020-11-16 Online:2021-01-15 Published:2021-07-15
Contact: * E-mail: lmsen2007@126.com
Supported by:
National Natural Science Foundation of China (41807172, 41975150).

摘要/Abstract

摘要： 全球氮沉降加剧在影响植物生长的同时可能改变植物水分利用特征,了解氮沉降下植被耗水规律对模拟和预测森林水文循环各分量演变特征意义重大。本研究以长白山阔叶红松林优势树种——蒙古栎、水曲柳和紫椴树为研究对象,通过氢氧同位素示踪法,分析不同氮素添加量(低氮添加组11.8 kg·hm^-2,L_N;高氮添加组23.6 kg·hm^-2,H_N)、不同模拟降水量(添加水量0、400、800和1600 mL,折合单次降雨量0、16、32和64 mm)下植株耗水来源、量值及规律。结果表明: 相对干旱条件下,L_N中蒙古栎、水曲柳和紫椴对土壤水分利用比例为26%、12%和20%,普遍高于H_N;随模拟降水量(16 mm)增加,L_N中蒙古栎、水曲柳和紫椴的土壤水分利用比例均达到最高值,分别为73%、70%和43%,H_N中该比例也达到高值,但小于L_N中的数值;当模拟降水量为32 mm时,土壤含水量近似长白山阔叶红松林生长季均值,H_N中树种平均土壤水分利用比例为39%,高于L_N中的16%;当模拟降水量为64 mm时,土壤水分饱和,L_N中蒙古栎、水曲柳和紫椴的土壤水分利用比例分别为14%、5%和1%,低于对应的H_N中的64%、13%和10%。在降水量较少、土壤相对干旱的条件下,各树种的土壤水分利用比例均较低,且随氮添加量的增加,该比例进一步降低;当降水量较高、土壤湿度高于生长季平均值时,各树种的土壤水分利用比例均较高,且随氮添加量的增加,该比例进一步升高。

关键词: 阔叶红松林, 水氮胁迫, 氢氧同位素, 水分来源, 水分利用比

Abstract: The aggravation of global nitrogen deposition may change plant water utilization and affect plant growth. Understanding the changes of vegetation water consumption under nitrogen deposition is of great significance for simulating and predicting the evolution of each component of forest hydrological cycle. We used the hydrogen and oxygen isotope tracer method to analyze water consumption source, quantity and law of Quercus mongolica (Qm), Fraxinus manshurica (Fm) and Tilia amurensis (Ta), the dominant species in broadleaved Korean pine forest of Changbai Mountain, under different add amounts of nitrogen [low nitrogen addition group (11.8 kg·hm^-2·a^-1), L_N; high nitrogen addition group (23.6 kg·hm^-2· a^-1), H_N] and different amounts of simulated precipitation (water addition amount were 0, 400, 800 and 1600 mL, equivalent to single rainfall amount were 0, 16, 32 and 64 mm, respectively). The results showed that under the condition of relative drought, soil water utilization ratio of Qm, Fm and Ta in the L_N group were 26%, 12% and 20%, higher than that in H_N group. When the amount of simulated precipitation was 16 mm, soil water utilization ratio of Qm, Fm and Ta in L_N group reached the highest, being 73%, 70% and 43%, respectively. This ratio also reached a high value in H_N group, but being less than the values in L_N group. When the amount of simulated precipitation was 32 mm, soil water content approximated the average value in broadleaved Korean pine forest in the growing season in Changbai Mountain. The average soil water utilization ratio of test tree species in H_N group was 39%, higher than that in L_N group (16%). When the amount of simulated precipitation reached 64 mm, the soil water was saturation. Soil water utilization ratio of Qm, Fm and Ta in L_N group was 14%, 5% and 1%, which was lower than that in H_N group, the corresponding ratio were 64%, 13% and 10%, respectively. In conclusion, under the condition of less precipitation and relatively dry soil, the soil water utilization ratio of those three tree species were lower, and the increases of nitrogen availability further reduced the ratio. When the amount of precipitation was high and soil moisture was higher than the average value of the growing season, soil water utilization ratio of those tree species was higher. With the increases of soil nitrogen availability, this ratio was further increased.

Key words: broadleaved Korean pine forest, water and nitrogen stress, hydrogen and oxygen isotopes, water source, water utilization ratio

赵松实, 林茂森, 王安志, 杨国范, 袁凤辉, 关德新. 水氮胁迫对长白山阔叶红松林优势树种水分利用的影响[J]. 应用生态学报, 2021, 32(1): 39-45.

ZHAO Song-shi, LIN Mao-sen, WANG An-zhi, YANG Guo-fan, YUAN Feng-hui, GUAN De-xin. Effects of water and nitrogen stress on water utilization of dominant species in broadleaved Korean pine forest in Changbai Mountain, China[J]. Chinese Journal of Applied Ecology, 2021, 32(1): 39-45.

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水氮胁迫对长白山阔叶红松林优势树种水分利用的影响

Effects of water and nitrogen stress on water utilization of dominant species in broadleaved Korean pine forest in Changbai Mountain, China

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