杉木人工林自然衰老叶和绿色叶凋落物分解对间伐强度和施肥的响应

doi:10.13292/j.1000-4890.202106.018

生态学杂志 ›› 2021, Vol. 40 ›› Issue (6): 1589-1598.doi: 10.13292/j.1000-4890.202106.018

杉木人工林自然衰老叶和绿色叶凋落物分解对间伐强度和施肥的响应

余坦蔚¹,葛志强¹,严强²,李梦娇¹,洪小敏¹,陈甜¹,胡亚林^1*

（¹福建农林大学林学院，森林生态稳定同位素研究中心, 福州 350007; ²福建农林大学西芹教学林场，福建南平 353001）

出版日期:2021-06-10 发布日期:2021-12-10

Responses of decomposition of naturally senescent and green leaf litter to thinning intensity and fertilization in Chinese fir plantation.

YU Tan-wei¹, GE Zhi-qiang¹, YAN Qiang², LI Meng-jiao¹, HONG Xiao-min¹, CHEN Tian¹, HU Ya-lin^1*

(¹College Forestry of Fujian Agriculture and Forestry University, Forest Ecology and Stable Isotope Research Center, Fuzhou 350007, China; ²West Celery Teaching Forest Farm of Fujian Agriculture and Forestry University, Nanping 353001, Fujian, China).

Online:2021-06-10 Published:2021-12-10

摘要/Abstract

摘要： 凋落物分解是森林生态系统能量流动与养分循环的重要过程。叶凋落物包括自然衰老叶凋落物（SL）和绿色叶凋落物（GL），但针对自然衰老和绿色叶凋落物分解速率和养分释放对人工林间伐强度和施肥措施的响应是否存在差异性尚不清楚。因此，本研究以亚热带13年生杉木（Cunninghamia lanceolata (Lamb.) Hook）人工林为对象，分析自然衰老和间伐剩余的绿色叶凋落物的分解速率、C、N和P释放对间伐强度（弱度间伐、中度间伐和强度间伐）和施肥（不施肥、施肥）的响应。研究发现，自然衰老和绿色叶凋落物分解和养分释放动态特征相似，但绿色叶凋落物的分解速率和养分释放均显著快于自然衰老叶凋落物。凋落物分解1年后SL和GL干物质残留率分别为58.4%和40.5%。杉木人工林间伐强度对2种类型叶凋落物的分解速率及C、N和P残留率的影响均不显著。施肥能够降低中度间伐条件下SL干物质残留率，提高叶凋落物N、P含量和叶凋落物P残留率。本研究结果表明，不同凋落物化学质量性状的差异是调控凋落物分解速率和养分释放的关键因素，保留杉木人工林间伐剩余绿色叶凋落物对维持林地土壤养分具有重要意义。

关键词: 叶凋落物, 杉木人工林, 间伐强度, 施肥, 养分释放, 分解速率

Abstract: Litter decomposition is an important process of energy flow and nutrient cycling in forests. Leaf litter includes naturally senescent leaf litter (SL) and green leaf litter (GL). It is not clear whether the responses of litter decomposition and nutrient releases between SL and GL to thinning intensity and fertilization in plantations are different. In this study, we compared the effects of thinning intensity and fertilization management on the decomposition rate and nutrient releases of C, N and P in the naturally senescent and green leaf litter in a 13-year-old Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) plantation. Our results showed that the dynamics of decomposition and nutrient release were similar between SL and GL. The decomposition rate and litter C, N and P releases were significantly faster in GL than SL. The remaining rates of dry matter in SL and GL were 58.4% and 40.5% after 1-year decomposition, respectively. Thinning intensity did not affect decomposition rate and the remaining rates of litter C, N, and P. Fertilization decreased dry matter remaining rate under medium thinning, but increased leaf litter N and P concentrations and the remaining rate of P content. Our results implied that litter chemical properties was one of the most important factors controlling litter decomposition rate and nutrient releases, and highlighted that reserving green leaf litter derived from thinning management was necessary to maintaining soil nutrient in Chinese fir plantations.

Key words: leaf litter, Chinese fir plantation, thinning intensity, fertilization, nutrient release, decomposition rate.

余坦蔚, 葛志强, 严强, 李梦娇, 洪小敏, 陈甜, 胡亚林. 杉木人工林自然衰老叶和绿色叶凋落物分解对间伐强度和施肥的响应[J]. 生态学杂志, 2021, 40(6): 1589-1598.

YU Tan-wei, GE Zhi-qiang, YAN Qiang, LI Meng-jiao, HONG Xiao-min, CHEN Tian, HU Ya-lin. Responses of decomposition of naturally senescent and green leaf litter to thinning intensity and fertilization in Chinese fir plantation.[J]. Chinese Journal of Ecology, 2021, 40(6): 1589-1598.

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杉木人工林自然衰老叶和绿色叶凋落物分解对间伐强度和施肥的响应

Responses of decomposition of naturally senescent and green leaf litter to thinning intensity and fertilization in Chinese fir plantation.

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