Combination of nitrogen and phosphorus fertilization enhance ecosystem carbon sequestration in a nitrogen-limited temperate plantation of Northern China.
Combination of nitrogen and phosphorus fertilization enhance ecosystem carbon sequestration in a nitrogen-limited temperate plantation of Northern China.
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DOI：
10.1016/j.foreco.2015.01.004
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发表时间：
2015-04
影响因子：
3.7
通讯作者：
Wenjing Zeng;Wei Wang
中科院分区：
文献类型：
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作者：
Wenjing Zeng;Wei Wang
大量研究表明，在氮素有限的生态系统中，增施氮素可以增加生态系统净生产力（NEP），但增加磷素的有效性如何影响氮素有限的生态系统的固碳作用尚不清楚。于2010年5月进行了为期3年的田间试验，（不施肥），N施肥（5 g N m− 2 yr −1），施磷肥（5 g P m− 2 yr −1），N + P施肥在北方河北省塞罕坝林场的樟子松（Pinus sylvestris）人工林中，采用5 g N m-2 yr-1和5 g P m-2 yr-1的氮素处理，这是中国最大的人工林面积。测定了净初级生产力（NPP）、土壤呼吸（SR）及其自养和异养组分、植物组织碳（C）和氮（N）浓度、土壤有机碳（SOC）和土壤全氮（TN）、微生物生物量和群落组成以及土壤pH。单独添加N或P对自养呼吸（AR）或异养呼吸（HR）没有显著影响;然而，当联合施用时，AR增加，HR显著降低。氮磷配施提高了NPP的21.97%，而氮磷配施对NPP的影响不显著。NEP不随P的增加而改变，但随着N和P的联合施肥而显著增加（510.23 g C m− 2 yr −1），比N的增加（339.63 g C m− 2 yr −1）高出近50%。两者合计，我们的研究结果表明，同时增加氮和磷促进碳储存在氮有限的生态系统，同时增加氮和磷的有效性是一种有效的方法，扩大碳固存能力的氮有限的人工林。
Numerous studies have shown that nitrogen (N) addition can increase net ecosystem production (NEP) in N-limited ecosystems, but it is still not clear how increasing phosphorus (P) availability affects carbon sequestration by N-limited ecosystems. A 3-year field experiment was established in May 2010 to compare the control (no fertilization), N fertilized (5 g N m−2yr−1), P fertilized (5 g P m−2yr−1), and N + P fertilized (5 g N m−2yr−1and 5 g P m−2yr−1) treatments in N-limitedPinus sylvestrisplantations of the Saihanba Forestry Center located in Hebei Province in northern China, which is the largest area of plantations in China. Net primary production (NPP), soil respiration (SR) and its autotrophic and heterotrophic components, plant tissues carbon (C) and N concentrations, soil organic carbon (SOC) and soil total nitrogen (STN), microbial biomass and community composition and the soil pH were measured. Addition of N or P alone had no significant effect on autotrophic respiration (AR) or heterotrophic respiration (HR); however, when applied in combination, AR increased and HR decreased significantly. Moreover, while N addition increased NPP by 10.16% and P addition had no significant effect on NPP, combined N and P fertilization increased NPP by 21.97%. NEP was unchanged by the addition of P, but increased significantly in response to combined N and P fertilization (510.23 g C m−2yr−1), nearly 50% higher than that observed in response to the addition of N (339.63 g C m−2yr−1). Taken together, our results indicate that simultaneous addition of both N and P promoted C storage in N-limited ecosystems and that simultaneously increasing in N and P availability is an effective method of expanding the C sequestration capacity of N-limited plantations.