Hu Shuang-chen, Xiong De-cheng, Huang Jin-xue, Deng Fei, Chen Yun-yu, Liu Xiao-fei, Chen Guang-shui
Ying Yong Sheng Tai Xue Bao. 2015 Nov;26(11):3259-67.
Fine root biomass and production in initial stage of three different regeneration approaches, i.e., natural regeneration with anthropogenic promotion (AR) , the Castanopsis carlesii plantation ( CC) and the Cunninghamia lanceolata plantation ( CL) on the clear-cutting sites of the secondary forest of C. carlesii (CK), in Sanming, Fujian Province, were investigated by using both minrhizotrons and the soil coring methods. The results of a year observation showed that the average fine root biomass was 422.5, 253.1, 197.2 and 162.8 g · m(-2), and the fine root production was 284.0, 182.6, 136.7 and 15.4 g · m(-2) · a(-1) for AR, CC, CL and CK, respectively. The maximum value of production was found in spring for AR and CC, in autumn for CL, and in winter for CK. Fine root production of other plants was higher than that of target tree species in CC, and vice verse in CL. There was a significant positive correlation between monthly fine root production and monthly precipitation in AR and CC. Significant positive correlation was found between monthly fine root production of other plants and monthly temperature in CL. The fine root under annual production and annual average biomass of these three young forests mainly distributed in the soil layer of 20- 40 cm, and mainly in the diameter class of 0-1 mm. The study demonstrated that the biomass and production of fine root under anthropogenic promotion were greater than that of the plantation, and the method of anthropogenic promotion were more conducive to increase the returning of organic matter, improve soil fertility, and maintain a high productivity in initial stage of forest regeneration.
采用微根管法和土钻法，对福建省三明市米槠次生林皆伐迹地上3种不同更新方式，即人为促进天然更新（AR）、米槠人工林（CC）和杉木人工林（CL）幼林初期的细根生物量和生产量进行了研究。1年观测结果表明，AR、CC、CL和皆伐迹地（CK）的平均细根生物量分别为422.5、253.1、197.2和162.8 g·m-2，细根生产量分别为284.0、182.6、136.7和15.4 g·m-2·a-1。AR和CC的细根生产量最大值出现在春季，CL出现在秋季，CK出现在冬季。CC中其他植物的细根生产量高于目标树种，而CL则相反。AR和CC的月细根生产量与月降水量之间存在显著正相关。CL中其他植物的月细根生产量与月温度之间存在显著正相关。这3种幼林的细根年生产量和年平均生物量主要分布在20-40 cm土层，直径主要集中在0-1 mm。研究表明，人为促进更新的细根生物量和生产量大于人工林，人为促进更新方式更有利于增加森林更新初期的有机质归还，提高土壤肥力，维持较高的生产力。
