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Nutrient Distribution Indicated Whole-Tree Harvesting as a Possible Factor Restricting the Sustainable Productivity of a Poplar Plantation System in China

机译：营养分配指示整树收获可能是限制中国杨树人工林系统可持续生产力的因素

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摘要

We evaluated the biomass and contents of five major macronutrients (N, P, K, Ca and Mg) in 10-year-old poplar trees (Populus deltoids Bartr. cv. “Lux”), and determined their nutrient use efficiencies (NUEs) at Zhoushan Forestry Farm (32°20′ N, 119°40′ E), Jiangsu province, in eastern China. The above- and below-ground biomass of poplar trees was 161.7 t ha-1, of which 53.3% was stemwood. The nutrient contents in the aboveground part were as follows: 415.1 kg N ha-1, 29.7 kg P ha-1, 352.0 kg K ha-1, 1083.0 kg Ca ha-1, and 89.8 kg Mg ha-1. The highest nutrient contents were in stembark, followed by branches, roots, stemwood, and foliage. The NUEs of the aboveground parts of poplar for N, P, K, Ca and Mg were 0.313, 4.377, 0.369, 0.120, 1.448 t dry biomass kg-1 nutrient, respectively, while those of stemwood were 1.294, 33.154, 1.253, 0.667, and 3.328 t dry biomass kg-1, respectively. The cycling coefficients, defined as the percentage of annual nutrient return in annual nutrient uptake, of N, P, K, Ca and Mg for the aboveground part were 87, 95, 69, 92, and 84%, respectively. Based on the NUE and nutrient cycling characteristics, shifting from whole-tree harvesting to stemwood-only harvesting and appropriately extending the harvest rotation could prevent site deterioration and support sustainable productivity of poplar plantation systems.
机译：我们评估了10年生杨树（Populus deltoids Bartr。cv。“ Lux”）中五种主要常量营养素（N，P，K，Ca和Mg）的生物量和含量，并确定了其养分利用效率（NUE）位于中国东部江苏省舟山林业农场（北纬32°20′，东经119°40′）。杨树地上和地下生物量为161.7 t ha -1 ，其中53.3％为枯木。地上部分的养分含量如下：415.1 kg N ha -1 ，29.7 kg P ha -1 ，352.0 kg K ha -1 ，1083.0 kg Ca ha -1 和89.8 kg Mg ha -1 。营养成分含量最高的是茎皮，其次是树枝，根，茎木和树叶。杨树地上部分N，P，K，Ca和Mg的NUE分别为0.313、4.377、0.369、0.120、1.448 t干生物量kg -1 养分，而stem木则为。干生物质kg -1 分别为1.294、33.154、1.253、0.667和3.328 t。地上部分的N，P，K，Ca和Mg的循环系数（定义为年养分吸收量中的年养分返回百分比）分别为87％，95％，69％，92％和84％。根据NUE和养分循环的特征，从整树采伐转向仅用材采伐并适当延长采伐轮换周期可以防止林地退化并支持杨树人工林的可持续生产力。

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    Xiaomin Ge; Ye Tian; Luozhong Tang;

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  • 年(卷),期 -1(10),5
  • 年度 -1
  • 页码 e0125303
  • 总页数 14
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