Home-field advantage of CWD decomposition in subtropical forests varied by field sites
Home-field advantage of CWD decomposition in subtropical forests varied by field sites
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DOI：
10.1016/j.foreco.2019.04.051
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发表时间：
2019-07
影响因子：
3.7
通讯作者：
Chunsheng Wu;Zhijian Zhang;Hankun Wang;Guoxian Huang;Chunjie Shu;Fanqian Kong;Yi Zhang;G. Wang;Yuan-qiu Liu
中科院分区：
文献类型：
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作者：
Chunsheng Wu;Zhijian Zhang;Hankun Wang;Guoxian Huang;Chunjie Shu;Fanqian Kong;Yi Zhang;G. Wang;Yuan-qiu Liu
以往的研究发现，主场优势（HFA）似乎是广泛的凋落物的分解，但很少有研究探讨HFA在森林生态系统中的粗木质残体（CWD）的分解。为了检验HFA假设的CWD分解，我们量化的CWD呼吸（RCWD）的不同树种在两年的研究期间。采用动态箱法，将3个树种的同一腐烂阶段的CWD分别置于2种不同的林分类型中，通过两个相互易位的田间试验，监测了CWD随时间的变化。所用的3个树种为柳杉（Cryptomeria japonica，CR）、化香（Platycarya strobilacea，PL）和青榨槭（Acer davidii，AC）; 2种林分类型为阔叶林（化香和青榨槭的主场;化香和青榨槭的客场）和针叶林（化香和青榨槭的主场;化香和青榨槭的客场）。我们还表征了微生物群落的每CWD和土壤下，以及对照土壤CWD的影响，通过磷脂脂肪酸（PLFA）的方法。结果表明，HF时PL和AC的RCWD显著高于VF，而CR时RCWD则相反。土壤微生物群落对CWD微生物群落的影响，尤其是对细菌组分的影响最大，田间点可解释CWD微生物群落总变异的17.4%。研究结果表明，家访地CWD分解的差异可以直接用家访地土壤微生物群落的差异来解释，而家访地土壤微生物群落的差异可能是由于两种立地（森林类型）土壤养分和凋落物质量的差异造成的。
Previous studies have found that home-field advantage (HFA) appears to be widespread in the decomposition of litter, but few studies have examined HFA in the decomposition of coarse woody debris (CWD) in forest ecosystems. To test the HFA hypothesis for CWD decomposition, we quantified the respiration of CWD (RCWD) for different tree species over a two-year study period. We used a dynamic chamber method to monitor RCWDover time in two reciprocal translocation field experiments by placing CWD of the same decay stage from three tree species into two different forest types. The three species used wereCryptomeria japonica(CR),Platycarya strobilacea(PL) andAcer davidii(AC); the two forest types were broadleaf forest (home field for PL and AC; visiting field for CR) and coniferous forest (home field for CR; visiting field for PL and AC). We also characterized the microbial community of each CWD and the soil underneath as well as the control soil without CWD influence by the method of phospholipid fatty acids (PLFAs). We found that the RCWDof PL and AC in the HF were significantly higher than that in the VF, while the opposite was true for the RCWDof CR. Soil microbial community affected CWD microbial community, especially for the bacteria component, with field site explaining 17.4% of the total variation in CWD microbial community. Our results suggest that the difference in CWD decomposition between home and visiting field was directly explained by the difference in soil microbial community between home and visiting field, which may be attributed to the differences in soil nutrient and litter quality between the two field sites (forest types).