退化草甸植物根系生产力对不同恢复措施的响应  

Response of root production to different restoration measures in a degraded meadow

作　　者：Meng Cui Hong-Hui Wu Chang-Qing Jing Tao Zhang Shi-Ying Zhao Ying-Zhi Gao 

机构地区：[1]Key Laboratory of Grassland Resources and Ecology of Xinjiang Uygur Autonomous Region,College of Grassland Science,Xinjiang Agricultural University,Urumqi 830052,China [2]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,the Chinese Academy of Sciences,Beijing 100093,China [3]State Key Laboratory of Effcient Utilization of Arid and Semi-arid Arable Land in Northern China,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China [4]Key Laboratory of Arable Land Quality Monitoring and Evaluation,Ministry of Agriculture and Rural Affairs,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China [5]Key Laboratory of Vegetation Ecology of the Ministry of Education,Jilin Songnen Grassland Ecosystem National Observation and Research Station,Northeast Normal University,Changchun 130024,China [6]Songyuan Agriculture and Rural Bureau,Songyuan 138000,China

出　　处：《Journal of Plant Ecology》2024年第3期141-152,共12页植物生态学报（英文版）

基　　金：National Key Research and Development Program of China(2019YFE0117000);National Natural Science Foundation of China(32271579);Regional Collaborative Innovation Project of Xinjiang Uygur Autonomous Region(2023E01008).

摘　　要：根系生产力及其动态变化对评价退化草地的恢复起着重要作用。然而,目前尚不清楚根系如何响应不同恢复措施。为了探究根系对不同恢复措施的响应,本研究于2013–2014年在退化草甸开展了田间试验。试验处理包括:自由放牧(FG)、不翻耕(NP)、仅翻耕(OP)、翻耕+施肥(PF)、翻耕+覆盖(PM)和翻耕+施肥+覆盖(PFM)。研究结果表明,根系的季节动态为单峰模式,主要受降水的影响,但不受恢复措施的影响。不同恢复措施对根系生产力的影响取决于降水量。在2013年,与FG相比,PFM通过增加ANPP、土壤含水量和根系数量显著提高根系生产力达242.34%(0–10 cm)和90.8%(10–20 cm);2014年不同恢复措施对根系生产力的影响不显著。根系周转在不同恢复措施间无显著变化,其范围为0.47–0.78 yr−1。这主要是由于在不同样地中优势物种均是一年生物种虎尾草(Chloris virgata),其根系周转变化相对较小。此外,PFM还通过改善土壤条件提高了根系寿命和存活率。上述结果表明,组合恢复措施是促进松嫩草甸地下根系恢复的有效途径。Belowground parameters,e.g.root production and dynamics,play a pivotal role in evaluating the restoration degree of degraded grasslands.However,it remains unclear how roots respond to the combined restoration measures.To investigate root responses to different restoration treatments,a feld experiment was conducted in a degraded Songnen meadow from 2013 to 2014.The treatments included:free grazing(FG),no ploughing(NP),only ploughing(OP),ploughing and fertilizer(PF),ploughing and mulching(PM),ploughing with fertilizer and mulching(PFM).Our results showed the seasonal dynamics pattern of roots was a unimodal pattern,which mainly was infuenced by precipitation rather than restoration measures.The impacts of different restoration measures on root production were dependent on precipitation.In 2013,compared with FG,only PFM signifcantly increased root production by 242.34%(0–10 cm)and 90.8%(10–20 cm),which was mainly attributed to the increase of aboveground net primary production,soil moisture and root numbers.However,restoration measures had minor effects on root production in 2014.Root turnover ranged from 0.47 to 0.78 yr−1 and was not signifcantly changed by different restored measures.This is because the dominant annual species,Chloris virgata,exhibited relatively small changes in root turnover across different plots.Moreover,PFM improved soil conditions,leading to increased root lifespan and survival rate.Our results suggest that the combined measures are an effective way to accelerate belowground restoration in the degraded Songnen meadow.

关 键 词：恢复措施 退化草甸 根系生产力 根系周转 根系寿命 

分 类 号：Q94[生物学—植物学]