Effects of forest regeneration practices on the flux of soil CO2 after clear-cutting in subtropical China
Effects of forest regeneration practices on the flux of soil CO2 after clear-cutting in subtropical China
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中国亚热带森林更新实践对砍伐后土壤CO2通量的影响
DOI：
10.1016/j.jenvman.2018.02.038
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
王懿祥
中科院分区：
文献类型：
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作者：
王懿祥
皆伐后的重新造林被用来促进迅速建立新的林分。然而，重新造林可能通过影响土壤温度和湿度而造成额外的土壤扰动，从而可能影响土壤呼吸。比较了不同造林方式对杉木种植园皆伐后土壤CO2通量的影响。未采伐（UC）、皆伐后不整地进行矮林更新（CC）、皆伐后进行矮林更新和整地、坑内抚育和重新造林（CCRP），和皆伐，然后进行矮林更新和重新造林，并进行全面的整地、抚育和重新种植。皆伐显著提高了土壤平均温度，降低了土壤平均含水量。与UC相比，CC、CCRP和CRO的CO2通量分别高19.19、37.49和55.93 mg m−2h− 1（P< 0.05）。CO2通量的差异主要归因于土壤温度、凋落物质量以及有机质与矿质土壤混合的变化。研究结果表明，与抚育更新相比，更新造林会增加CO2的释放量，就CO2排放量而言，坑内整地和抚育比整体整地和抚育更好。
Reforestation after clear-cutting is used to facilitate rapid establishment of new stands. However, reforestation may cause additional soil disturbance by affecting soil temperature and moisture, thus potentially influencing soil respiration. Our aim was to compare the effects of different reforestation methods on soil CO2flux after clear-cutting in a Chinese fir plantation in subtropical China: uncut (UC), clear-cut followed by coppicing regeneration without soil preparation (CC), clear-cut followed by coppicing regeneration and reforestation with soil preparation, tending in pits and replanting (CCRP), and clear-cut followed by coppicing regeneration and reforestation with overall soil preparation, tending and replanting (CCRO). Clear-cutting significantly increased the mean soil temperature and decreased the mean soil moisture. Compared to UC, CO2fluxes were 19.19, 37.49 and 55.93 mg m−2h−1higher in CC, CCRPand CCRO, respectively (P< 0.05). Differences in CO2fluxes were mainly attributed to changes in soil temperature, litter mass and the mixing of organic matter with mineral soil. The results suggest that, when compared to coppicing regeneration, reforestation practices result in additional CO2released, and that regarding the CO2emissions, soil preparation and tending in pits is a better choice than overall soil preparation and tending.