Zhang Nan, Yang Zhi-Jie, Xu Chao, Liu Xiao-Fei, Xiong De-Cheng, Lin Cheng-Fang
Fujian Provincial Key Laboratory for Plant Eco-physiology/School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China.
Sanming Forest Ecosystem and Global Change National Observation and Research Station, Sanming 365000, Fujian, China.
Ying Yong Sheng Tai Xue Bao. 2022 Feb;33(2):321-328. doi: 10.13287/j.1001-9332.202202.021.
To understand the impacts of mid-subtropical forest conversion on carbon and nutrient cycling, we conducted a 4-year investigation to examine litterfall, nutrient return and nutrient use efficiency of natural forest, secondary forest and plantation which were transformed from natural forest. The results showed that after natural forest was transformed into secon-dary forest and plantation, the annual litter production decreased by 29.0% and 45.7%, nitrogen return of litter decreased by 34.0% and 72.7%, and phosphorus return decreased by 38.1% and 56.4%, respectively. The amount of carbon returned from litterfall in natural forest was 25.6% and 44.3% higher than that in secondary forest and plantation, respectively. For plantation, secondary forest and natural forest, nitrogen use efficiency of litterfall was 175.4, 94.8 and 92.0 kg·kg, respectively, and phosphorus use efficiency of litterfall was 3031.0, 2791.6 and 2537.2 kg·kg, respectively. It was concluded that plantation was more limited by nitrogen compared with natural forest and secondary forest, and the effects of phosphorus limitation had similar effects on the three forests.
为了解中亚热带森林转变对碳和养分循环的影响，我们进行了为期4年的调查，以研究天然林、次生林以及由天然林转变而来的人工林的凋落物、养分归还和养分利用效率。结果表明，天然林转变为次生林和人工林后，年凋落物产量分别下降了29.0%和45.7%，凋落物的氮归还量分别下降了34.0%和72.7%，磷归还量分别下降了38.1%和56.4%。天然林凋落物的碳归还量分别比次生林和人工林高25.6%和44.3%。对于人工林、次生林和天然林，凋落物的氮利用效率分别为175.4、94.8和92.0 kg·kg，磷利用效率分别为3031.0、2791.6和2537.2 kg·kg。研究得出结论，与天然林和次生林相比，人工林受氮的限制更大，磷限制对这三种森林的影响相似。
