覆盖对雷竹细根碳氮磷化学计量特征的影响
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引用本文:刘思泽,张小国,陈露蔓,高卿容,陈嵚崟,范 川,李贤伟.覆盖对雷竹细根碳氮磷化学计量特征的影响[J].西北植物学报,2019,39(12):2253~2262
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作者单位
刘思泽1,2,张小国4,陈露蔓1,2,高卿容1,2,陈嵚崟1,2,范 川1,2,3,李贤伟1,2,3* (1 四川农业大学 林学院,成都 6111302 四川农业大学 长江上游森林资源保育与生态安全国家林业和草原局重点实验室成都 6111303 长江上游林业生态工程四川省重点实验室,成都 6111304 四川省林业勘察设计研究院,成都 611181) 
基金项目:四川省市场监督管理局四川省地方标准(DB51/T 2574 2019);
中文摘要:为了探讨不同覆盖年限下雷竹(Phyllostachys praecox)细根碳(C)、氮(N)、磷(P)化学计量特征,明确雷竹细根养分动态对覆盖经营措施的响应,为实现雷竹笋用林地养分平衡和高效经济效益提供理论依据。该研究以雅安市雨城区草坝镇已开展连续4年覆盖(LM)、连续2年覆盖(SM)、不覆盖(CK)3种不同覆盖年限下的笋用雷竹林为研究对象,覆盖材料为谷壳(上层保温层)和稻草(下层增温层),在每个标准地内“S”形布设采样点并使用根系取样器对0~30 cm土层细根于各季节取样,分析计算不同覆盖年限下雷竹细根C、N、P的化学计量特征。结果显示:(1)覆盖年限和季节均能显著影响雷竹细根C、N、P含量及其化学计量比,与季节相比覆盖年限是影响雷竹细根C、N、P含量及其化学计量比的更关键因素。(2)SM能增高细根养分含量,而LM会降低细根养分含量,覆盖影响细根C、N养分含量的季节变化规律,而不影响P的季节变化规律。(3)3种处理的C/N、C/P、N/P均分别具有相同的季节变化规律,SM降低雷竹细根各季节和年平均C/N,而LM增加雷竹细根各季节和年平均C/N,SM和LM均能降低雷竹细根各季节和年平均C/P和N/P,LM较SM各季节和年平均C/P增大,但两者各季节N/P差异均不显著(P > 0.05)。(4)相关性分析显示,覆盖年限增长会使雷竹细根C、N、P及其化学计量比之间形成更为复杂的显著相关关系。研究表明,长期连续覆盖会降低雷竹细根C、N、P含量,同时造成细根养分失衡,雷竹林的覆盖经营需降低连续覆盖时间,采取短期覆盖经营措施,给细根休养恢复的时间,从而达到雷竹笋用林可持续经营目的。
中文关键词:雷竹  覆盖  细根        化学计量
 
Effect of Mulching Management on C, N, P Stoichiometry Characteristics of Fine Roots of Phyllostachys praecox
Abstract:This study explored the C, N, P stoichiometry characteristics in fine roots of Phyllostachys praecox with different mulching years, to understand the response of fine root nutrient dynamics to mulching management, and to provide a theoretical basis about reasonable development of coverage management to achieve efficient and sustainable economic benefits. Investigation was carried out in the P. praecox plantation with different mulching years,include long term mulching (LM, continuous coverage for 4 years), short term mulching (SM, continuous coverage for 2 years) and not cover (CK), located in Caoba Town, Yucheng District, Yaan City. The mulching materials are rice husk (insulation layer) and rice straw (warming layer). In mid late of July, October 2017 and January, April 2018, s shaped points were selected in each sample plot. Fine root samples were collected at 0-30 cm depth and the C,N,P stoichiometry characteristics of fine roots were determined. This results showed that: (1) the effects of different mulching years on fine root C content, N content, P content, C/N ratio, C/P ratio and N/P ratio of P. praecox were greater that of different seasons. Compared with seasons, mulching years were more important factors for C content, N content, P content and their stoichiometric ratios. (2) Short term mulching could increase the nutrient contents of fine roots, while long term mulching could reduce the nutrient contents of fine roots, and mulching could affect the seasonal variation of C and N nutrient contents in fine roots, but not P. (3) C/N, C/P and N/P ratios of the three treatments had the same seasonal variation law. Short term mulching reduced the average annual and each season C/N ratios in fine roots, while long term mulching increased the average annual and each season C/N ratios in fine roots. Mulching could reduce the average annual and each season C/P ratio in fine roots, but the long term mulchings C/P ratio was higher than that with short term mulching. Mulching could reduce the average annual and each season N/P ratios in fine roots. There was no significant difference between long term mulching and short term mulching in each season N/P ratios of fine roots (P > 0.05). (4) The correlation analysis showed that the increase of mulching years would lead to a more complex significant correlation between C, N, P and their stoichiometric ratios. This results indicate that long term continuous mulching can reduce the C, N and P contents in fine roots of P. praecox, and cause the imbalance of nutrients of fine roots. The mulching management of P. praecox plantations needs to reduce the continuous mulching time, adopt short term mulching management measures, and give the time for fine roots to recover, so as to achieve the goal of sustainable management of P. praecox plantations.
keywords:Phyllostachys praecox  mulching  fine root  carbon  nitrogen  phosphorus  stoichiometry
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