Nutrient distribution indicated whole-tree harvesting as a possible factor restricting the sustainable productivity of a poplar plantation system in China.
Nutrient distribution indicated whole-tree harvesting as a possible factor restricting the sustainable productivity of a poplar plantation system in China.
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DOI：
10.1371/journal.pone.0125303
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Tang L
中科院分区：
文献类型：
--
作者：
Ge X;Tian Y;Tang L
研究了10年生白杨黑杨（Populus deltoids Bartr.）CV.“Lux”），并测定了江苏舟山林场（32°20′ N，119°40′ E）的养分利用效率。白杨地上、地下生物量为161.7 t ha-1，其中干材占53.3%。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-1，89.8 kg Mg ha-1。营养元素含量以茎皮最高，其次为枝、根、茎、叶。白杨地上部分N、P、K、Ca和Mg的营养素利用率分别为0.313、4.377、0.369、0.120和1.448 t干生物量kg-1，而树干的营养素利用率分别为1.294、33.154、1.253、0.667和3.328 t干生物量kg-1。地上部分N、P、K、Ca和Mg的循环系数（即年养分归还量占年养分吸收量的百分比）分别为87%、95%、69%、92%和84%。根据杨树人工林的养分循环特征，从全木采伐转向全木采伐，并适当延长采伐轮伐期，可有效防止立地退化，支持白杨种植园系统的可持续生产力。
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.
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