Wang Zhen-Yu, Wang Tao, Zou Bing-Zhang, Wang Si-Rong, Huang Zhi-Qun, Wan Xiao-Hua
School of Geographical Science, Fujian Normal University, Fuzhou 350007, China.
Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China.
Ying Yong Sheng Tai Xue Bao. 2020 Nov;31(11):3597-3604. doi: 10.13287/j.1001-9332.202011.005.
We investigated soil C:N:P stoichiometry and nutrient dynamics of plantations at different stand ages (5, 8, 21, 27 and 40 years old) in Fujian Baisha Fores-try Farm. We measured the concentrations of soil total carbon (TC), total nitrogen (TN), total phosphorus (TP), total potassium (TK), total calcium (Ca), total magnesium (Mg), and soil C:N:P stoichiometry at 0-10, 10-20, and 20-40 cm soil layers during different growth stages. The results showed that soil TC and TN concentrations and C:N remained unchanged during stand development. Soil TP content showed an increase-decrease-increase trend with increasing stand ages. Soil TP content was lowest, whereas C:P and N:P were highest at the mature stage of plantation in the 0-10 and 10-20 cm soil layers. However, soil TP content showed no significant differences in all stand ages at the 20-40 cm soil layer. The contents of Ca and Mg were lowest at the mature stage of stand. The TC was positively correlated with soil C:N, C:P and N:P. The TP was significantly and negatively correlated with soil C:P and N:P. Soil TP was a key factor regulating soil C:P and N:P stoichiometry. The development of mature plantation was mainly limited by soil P availability. To sustain the development of plantations and improve nutrient cycling, phosphorus fertilizer could be applied during the rapid growth period of . In addition, an appropriate extension of the rotation period of plantation could facilitate soil nutrient restoration.
我们研究了福建白沙林场不同林龄（5年、8年、21年、27年和40年）人工林的土壤碳氮磷化学计量比及养分动态。在不同生长阶段，我们测量了0 - 10厘米、10 - 20厘米和20 - 40厘米土层中土壤总碳（TC）、总氮（TN）、总磷（TP）、总钾（TK）、总钙（Ca）、总镁（Mg）的浓度以及土壤碳氮磷化学计量比。结果表明，在林分发育过程中，土壤TC和TN浓度以及C:N保持不变。土壤TP含量随林龄增加呈先增加后减少再增加的趋势。在0 - 10厘米和10 - 20厘米土层中，人工林成熟阶段土壤TP含量最低，而C:P和N:P最高。然而，在20 - 40厘米土层中，所有林龄的土壤TP含量均无显著差异。Ca和Mg的含量在林分成熟阶段最低。TC与土壤C:N、C:P和N:P呈正相关。TP与土壤C:P和N:P呈显著负相关。土壤TP是调节土壤C:P和N:P化学计量比的关键因素。成熟人工林的发育主要受土壤有效磷的限制。为维持人工林的发展并改善养分循环，可在快速生长期施用磷肥。此外，适当延长人工林轮伐期有助于土壤养分恢复。
