N沉降下川中丘陵地区柏树人工林根系分泌物特征及其介导的根际C、N转化过程

doi:10.13292/j.1000-4890.202202.018

摘要/Abstract

摘要： 尽管根系分泌物在调控森林土壤功能和土壤生物地球化学循环过程中具有重要作用，但目前关于N沉降下森林根系分泌物输入特征及其介导的根际土壤C、N过程认识还甚为有限。本研究以川中丘陵地区典型柏树人工林为试验对象，通过不同N添加水平模拟N沉降强度，于2020年不同季节对根系分泌物进行原位收集和分析，并同步分析了根际与非根际土壤的微生物生物量和土壤C、N矿化速率的变化，以揭示不同N添加处理对根系分泌物C输入季节动态变化规律及其介导的土壤C、N微生物过程差异。结果表明：（1）N添加显著降低了柏树人工林根系分泌物C输入速率与年通量，且高N处理对分泌物C输入的抑制作用更强烈。（2）N添加显著抑制了柏树人工林土壤C、N矿化速率以及土壤微生物C、微生物N的根际效应，且高N处理对土壤C、N微生物过程根际效应的抑制幅度更大。（3）根系C、N过程根际效应大小呈现春、夏季逐渐升高，秋、冬季逐渐降低的季节动态变化，且夏季根际效应值最高。N沉降显著降低了柏树人工林的根系分泌速率与通量，并明显抑制了根际土壤C、N转化微生物过程，且抑制效应强度与N添加水平有关，证实了森林根系分泌物微生物特征土壤养分转化过程之间存在密切的偶联效应。本研究结果丰富了全球变化下森林根际生态过程的科学认识，为川中丘陵区大面积的人工林适应性管理与生态恢复实践提供一定的科学依据。

关键词: 柏树人工林, 川中丘陵地区, 根系分泌物, 根际效应, C、N转化过程

Abstract: Root exudates play an important role in regulating forest soil function and soil biogeochemical cycling. However, current understanding on input characteristics of forest root exudates and C and N processes mediated by rhizosphere soil under N deposition is still limited. This study took cypress (Cupressus funebris) plantation in the hilly area of central Sichuan as the research object. Different levels of N addition were used to simulate atmospheric N deposition. In 2020, root exudates were collected and analyzed in different seasons, and microbial biomass and C and N mineralization rate of rhizosphere/non-rhizosphere soils were analyzed, to reveal the seasonal variations of C input rate of root exudates, and the differences in soil C and N microbial process mediated by root exudates under different N addition treatments. The results showed that: (1) N addition significantly reduced C input rate and annual flux of root exudates in cypress plantation, with higher N addition having stronger inhibitory effect on C input of root exudates. (2) N addition significantly inhibited the rhizosphere effects of soil C and N mineralization and soil microbial C and N, with stronger inhibition effect of higher N treatment on soil C and N microbial processes. (3) The rhizosphere effect of root C and N process showed seasonal variation that gradually increased in spring and summer, and decreased in autumn and winter, peaking in summer. Our results demonstrated that N addition significantly reduced the rate and flux of root exudates of cypress forest, and significantly inhibited the microbial C and N transformation in rhizosphere soil. The intensity of inhibitory effect was related to N addition level, which confirmed the close relationship between forest root mexudatesmicrobial characteristics transformation processes of soil nutrients. Our results improved the understanding of forest rhizosphere processes under global change and provided scientific basis for adaptive management and ecological restoration of large-scale plantation forests in hilly area of central Sichuan.

Key words: Cupressus funebris, hilly region of central Sichuan, root exudation, rhizosphere effect, C and N transformation process.

白志勇, 任可心, 陈梦雨, 苟永祥, 许航, 陈兰英, 肖娟. N沉降下川中丘陵地区柏树人工林根系分泌物特征及其介导的根际C、N转化过程[J]. 生态学杂志, 2022, 41(3): 454-464.

BAI Zhi-yong, REN Ke-xin, CHEN Meng-yu, GOU Yong-xiang, XU hang, CHEN Lan-ying, XIAO Juan. Root exudates characteristics and associated soil C and N transformation processes of Cupressus funebris plantation in hilly region of central Sichuan under N deposition.[J]. Chinese Journal of Ecology, 2022, 41(3): 454-464.

[1]	莫思琪, 曹旖旎, 谭倩. 根系分泌物在重金属污染土壤生态修复中的作用机制研究进展 [J]. 生态学杂志, 2022, 41(2): 382-392.
[2]	蒋治岩, 邹青勤, 杨柳, 李汶倬, 张鹤东, 陈祥伟, 王秀伟. 典型黑土区不同菌根类型树种根系分泌速率及根际效应差异 [J]. 生态学杂志, 2021, 40(9): 2709-2718.
[3]	魏嘉禾, 陈斌. 基于根系分泌物研究混合型邻群环境对小麦幼苗亲缘识别的调控作用 [J]. 生态学杂志, 2020, 39(8): 2610-2615.
[4]	马志良,赵文强. 植物群落向土壤有机碳输入及其对气候变暖的响应研究进展 [J]. 生态学杂志, 2020, 39(1): 270-281.
[5]	易艳灵,吴丽英,杨倩,任永胜,刘海,李贤伟,范川. 柏木根系分泌物对盆栽香椿土壤养分和酶活性的影响 [J]. 生态学杂志, 2019, 38(7): 2080-2086.
[6]	倪惠菁,苏文会,范少辉,曾宪礼,金艺. 养分输入方式对森林生态系统土壤养分循环的影响研究进展 [J]. 生态学杂志, 2019, 38(3): 863-872.
[7]	刘顺1,2,盛可银2,刘喜帅2,吴珍花2,郭晓敏2,3,肖复明4,张文元2,3*. 陈山红心杉根际土壤有机碳、氮含量及根际效应 [J]. 生态学杂志, 2017, 36(7): 1957-1964.
[8]	孙燕1,2,杨建峰1,2,董云萍1,2*,林兴军1,2,闫林1,2,黄丽芳1,2,王晓阳1,2,陈鹏1. 咖啡根系分泌物对嫁接后植株生长及叶片保护酶活性的影响 [J]. 生态学杂志, 2017, 36(5): 1310-1314.
[9]	朱锦惠1,董坤2,杨智仙3,董艳1*. 间套作控制作物病害的机理研究进展 [J]. 生态学杂志, 2017, 36(4): 1117-1126.
[10]	陈智裕1,2,3,马静1,2,3,赖华燕1,2,马祥庆1,2,吴鹏飞1,2*. 植物根系对根际微环境扰动机制研究进展 [J]. 生态学杂志, 2017, 36(2): 524-529.
[11]	李光,白文斌,任爱霞. 高粱不同连作年限对其根系分泌物组成和化感物质含量的影响 [J]. 生态学杂志, 2017, 36(12): 3535-3544.
[12]	段剑,杨洁**,康金林,喻驰方,涂安国. 马尾松根际土壤提取物的化感作用 [J]. 生态学杂志, 2015, 34(3): 773-780.
[13]	赵晓红1,2,杨殿林2,曲波1,王慧2,刘红梅2,赖欣2,皇甫超河2**. 黄顶菊入侵对土壤氨氧化细菌群落结构及多样性的影响 [J]. 生态学杂志, 2014, 33(6): 1492-1500.
[14]	黄永芳1,杨秋艳1,张太平1,2**,何金涛3. 水培条件下两种植物根系分泌特征及其与污染物去除的关系 [J]. 生态学杂志, 2014, 33(2): 373-379.
[15]	孙跃志1,杨立学2**,王东亮2. 胡桃楸林地胡桃醌与土壤微生物种群关系 [J]. 生态学杂志, 2013, 32(11): 2926-2930.

N沉降下川中丘陵地区柏树人工林根系分泌物特征及其介导的根际C、N转化过程

Root exudates characteristics and associated soil C and N transformation processes of Cupressus funebris plantation in hilly region of central Sichuan under N deposition.

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

编辑推荐

Metrics

本文评价