植物生态学报 ›› 2017, Vol. 41 ›› Issue (4): 418-429.doi: 10.17521/cjpe.2016.0340

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毛竹林地表覆盖年限对土壤有机碳的影响

赵睿宇1, 李正才1,*(), 王斌1, 葛晓改1, 戴云喜2, 赵志霞1, 张雨洁1   

  1. 1中国林业科学研究院亚热带林业研究所, 杭州 311400
    2台州市黄岩区林业技术推广总站, 浙江黄岩 318020
  • 收稿日期:2016-11-03 接受日期:2017-03-01 出版日期:2017-04-10 发布日期:2017-05-19
  • 通讯作者: 李正才 E-mail:lizccaf@126.com
  • 基金资助:
    浙江省科技厅重大项目(2015C32012)和浙江省科技厅团队特派员项目(2012T2T120和浙科发农[2013]215-95)

Duration of mulching caused variable pools of labile organic carbon in a Phyllostachys edulis plantation

Rui-Yu ZHAO1, Zheng-Cai LI1,*(), Bin WANG1, Xiao-Gai GE1, Yun-Xi DAI2, Zhi-Xia ZHAO1, Yu-Jie ZHANG1   

  1. 1Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou 311400, China
    and
    2Taizhou Huangyan District Forestry Technology Popularization Station, Huangyan, Zhejiang 318020, China
  • Received:2016-11-03 Accepted:2017-03-01 Online:2017-04-10 Published:2017-05-19
  • Contact: Zheng-Cai LI E-mail:lizccaf@126.com

摘要:

为了解毛竹(Phyllostachys edulis)林不同年限地表覆盖对土壤总有机碳及土壤活性有机碳含量的影响, 以浙江省台州市黄岩区山地毛竹林为研究对象, 对覆盖1年、覆盖2年和自然生长(对照)的毛竹林地0-50 cm内各土层土壤活性有机碳含量进行了比较研究。结果表明: 1)地表覆盖1年和2年的毛竹林样地土壤总有机碳、轻组有机质和易氧化碳含量均高于对照样地, 相比于对照样地, 覆盖1年的毛竹林样地土壤总有机碳、土壤轻组有机质、土壤易氧化碳含量分别增加11.2%-74.2%、31.7%-196.9%、5.0%-79.6%, 覆盖2年的毛竹林样地土壤总有机碳、土壤轻组有机质和土壤易氧化碳含量分别增加22.2%-90.8%、36.7%-238.5%、21.9%-97.5%。不同处理样地的土壤水溶性有机碳含量差异不明显。2)对照样地土壤水溶性有机碳占总有机碳的比率高于覆盖处理的毛竹林地, 而易氧化碳占总有机碳的比率在0-30 cm土层表现为覆盖1年>覆盖2年>对照样地。3)覆盖1年、覆盖2年和自然生长3种处理下, 土壤水溶性有机碳、易氧化碳、轻组有机质和总有机碳含量呈现较高的相关性, 且对照样地土壤水溶性有机碳与总有机碳的相关系数大于覆盖1年和覆盖2年的毛竹林地, 覆盖2年的毛竹林样地易氧化碳与轻组有机质的相关系数最大。4)三种处理方式下, 土壤总有机碳、水溶性有机碳、易氧化碳、轻组有机质与土壤养分(全氮、水解氮、有效磷、速效钾、交换性钙、交换性镁)的相关性达到显著或极显著水平。短期内毛竹地表覆盖有利于提高土壤总有机碳、土壤活性有机碳和土壤养分元素含量, 对改善毛竹林土壤质量, 维持竹林可持续经营具有一定的促进作用。

关键词: 毛竹, 地表稻草覆盖, 土壤有机碳, 土壤活性有机碳, 土壤养分

Abstract:
Aims Soil total organic carbon and labile organic carbon are important indicators in evaluating soil quality. Mulching is widely applied to promote the emergence of bamboo shoot in winter time through stand management. Yet the consequences of mulching on soil quality in Phyllostachys edulis have not been well studied. We aim at the quantitative effect of mulching duration on soil quality in P. edulis stands.
Methods Several P. edulis stands located in Huangyan District of Taizhou, Zhejiang Province of China, had been applied with mulching for 1-2 years and were used in this study to assess the mulching effects. We also selected stands without mulching treatment as the reference sites (or control, CK) for comparisons.||||Important findings Total soil organic carbon (TOC), light fraction organic matter (LFOM), and easily-oxidized carbon (EOC) contents at stands with 1-year and 2-year mulching treatments were significantly increased compared with those at the CK sites. The 1-year mulching increased TOC, LFOM and EOC by 11.2%-74.2%, 31.7%-196.9% and 5.0%-79.6%, respectively, than those of CK sites, while by 22.2%-90.8%, 36.7%-238.5%, and 21.9%-97.5% with 2-year treatment. However, the contents of water-soluble organic carbon (WSOC) changed insignificantly. Among the indicators, we found that WSOC:TOC in CK was higher than that with the mulching treatments, while EOC:TOC with 1-year treatment was higher than that with 2-year treatment, and EOC:TOC with 2-year treatment was higher than that of CK. Additionally, WSOC, EOC, and LFOM at all three treatments showed high correlations with TOC, with a higher correlation coefficient of WSOC with TOC of 0- 30 cm soil layers in CK than those with mulching treatments. The correlation coefficient of EOC and LFOM with TOC was the highest at the 2-year mulching sites. More importantly, TOC, WSOC, EOC, and LFOM were significantly (p < 0.05), or extremely significantly (p < 0.01), correlated with soil nutrient content, including total N, hydrolysis N, available P, available K, exchangeable Ca, and exchangeable Mg in all treatments. In sum, it appeared that mulching in short term can increase the contents of TOC, soil labile organic carbons and soil nutrients in bamboo soils, yielding an improved soil quality and thus can be promoted as a plausible practice for the sustainable management of P. edulis stands.

Key words: Phyllostachys edulis, soil mulching with straw, soil organic carbon, soil labile organic carbon, soil nutrients