Soil Nitrogen Availability Affects Belowground Carbon Allocation and Soil Respiration in Northern Hardwood Forests of New Hampshire
Soil Nitrogen Availability Affects Belowground Carbon Allocation and Soil Respiration in Northern Hardwood Forests of New Hampshire
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DOI：
10.1007/s10021-015-9892-7
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发表时间：
2015-11-01
期刊：
影响因子：
3.7
通讯作者：
Fisk, Melany
中科院分区：
文献类型：
--
作者：
Bae, Kikang;Fahey, Timothy J.;Fisk, Melany
森林中植物养分的获取需要根系和真菌的呼吸作用。因此，地下碳分配和土壤呼吸应反映分配给养分吸收的植物努力，例如，在不同的养分有效性由网站质量或林分历史控制的条件下。土壤呼吸，地下C分配，细根生物量进行了测定，在三个不同的养分供应的北方硬木林的白色山脉的新罕布什尔州。年土壤呼吸和地下C分配在两个立场在每个网站上测得的最低的杰弗斯溪，该网站的养分供应量最高，哈伯德溪和巴特利特实验林较高。中龄林分（31-41年生）和老林分（> 80年生）的土壤呼吸和地下碳分配差异均不显著，但老林分细根（< 1 mm）生物量高于中龄林分。在生长季节，土壤呼吸是低的净氮矿化和净硝化高，在广泛的样本的13个立场和年度地下C分配减少，增加硝化在6个深入研究的立场。土壤有效磷与土壤呼吸无明显相关性。N的可用性，地下C分配，和土壤呼吸之间的关系支持的说法，森林分配更多的C地下生态系统中的限制性养分的可用性低。
Plant nutrient acquisition in forests requires respiration by roots and mycorrhizae. Belowground carbon allocation and soil respiration should thus reflect plant effort allocated to nutrient uptake, for example in conditions of different nutrient availabilities controlled by site quality or stand history. Soil respiration, belowground C allocation, and fine root biomass were measured in three sites differing in nutrient availability in the northern hardwood forests of the White Mountains of New Hampshire. Annual soil respiration and belowground C allocation measured in two stands at each site were lowest at Jeffers Brook, the site with highest nutrient availability, and higher at Hubbard Brook and Bartlett Experimental Forests. Neither soil respiration nor belowground C allocation differed significantly between mid-aged (31-41 year old) and older stands (> 80 year old) within the sites, despite higher fine root (< 1 mm) biomass in old stands than mid-aged stands. During the growing season, soil respiration was low where net nitrogen mineralization and net nitrification were high across an extensive sample of thirteen stands and annual belowground C allocation decreased with increasing nitrification across the six intensively studied stands. Available P was not related to soil respiration. The relationships among N availability, belowground C allocation, and soil respiration support the claim that forests allocate more C belowground in ecosystems with low availability of a limiting nutrient.