Understory management and fertilization affected soil greenhouse gas emissions and labile organic carbon pools in a Chinese chestnut plantation
Understory management and fertilization affected soil greenhouse gas emissions and labile organic carbon pools in a Chinese chestnut plantation
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林下管理和施肥影响板栗园土壤温室气体排放和不稳定有机碳库
DOI：
10.1016/j.foreco.2014.11.004
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发表时间：
2015-02
影响因子：
3.7
通讯作者：
Peikun Jiang
中科院分区：
文献类型：
--
作者：
Scott X. Chang;Hua Qin;Shenglei Fu;Peikun Jiang
管理实践显着影响人工林的碳 (C) 循环。然而，人工林中林下管理和施肥对土壤温室气体（GHG）通量和不稳定有机碳库的相互作用仍不清楚。为了研究板栗种植园林下替换、施肥及其相互作用对土壤温室气体通量和不稳定有机碳库的影响，我们在为期 12 个月的田间研究中进行了 2 × 2 析因实验，采用四种处理：对照（林下植被移除而不进行林下替换或施肥）、林下替换（林下林移除并播种苜蓿，MS）、施肥（F）和 MS + F。使用静态室/GC 技术测定通量。在这项为期一年的研究中，任何处理方法中的温室气体通量季节性模式均未发生变化；然而，土壤温室气体通量、温室气体通量的总全球变暖潜势（GWP）以及土壤有机碳（SOC）、水溶性有机碳（WSOC）、微生物量碳（MBC）和NO3−–N浓度受到MS、F及其相互作用的显着影响。此外，无论林下置换处理如何，GHG通量、GWP、SOC、WSOC、MBC和NO3−–N浓度均因施肥而显着增加（P<0.05），但仅在施肥地块中，它们因林下置换而增加。所有样地的 GHG 通量均与土壤温度和 WSOC 相关（P < 0.05），但与土壤湿度和 MBC 无关。这些发现表明，林下替换可能是减少/最小化温室气体通量的最佳管理技术，而 F 可以增强 MS 对增加土壤有机碳和养分有效性的影响。我们的结论是，应采取适度施肥和豆科植物林下置换相结合的方式来增加土壤碳固存，保持土壤肥力并可持续发展板栗种植园。
Management practices markedly impact carbon (C) cycling in forest plantations. However, the interactive effects of understory management and fertilization on soil greenhouse gas (GHG) fluxes and labile organic C pools remain unclear in forest plantations. To investigate the effects of understory replacement, fertilization, and their interaction on soil GHG fluxes and labile organic C pools in a Chinese chestnut plantation, we conducted a 2 × 2 factorial experiment over a 12-month field study with four treatments: Control (understory removed without understory replacement or fertilization), understory replacement (understory removed and seeded withMedicago sativaL., MS), fertilization (F), and MS + F. The GHG fluxes were determined using a static chamber/GC technique. The seasonal pattern of GHG fluxes did not change in any of the treatments in this one-year study; however, soil GHG fluxes, total global warming potential (GWP) of GHG fluxes, and soil organic C (SOC), water soluble organic C (WSOC), microbial biomass C (MBC), and NO3−–N concentrations were significantly affected by MS, F, and their interaction. In addition, GHG fluxes, GWP, and SOC, WSOC, MBC and NO3−–N concentrations were markedly increased by fertilization, regardless of the understory replacement treatment (P< 0.05), but they were increased by understory replacement only in the fertilized plots. The GHG fluxes were correlated with soil temperature and WSOC in all plots (P< 0.05), but not with soil moisture and MBC. These findings suggest that understory replacement likely is the optimum management technique for reducing/minimizing GHG fluxes, while F can enhance the effects of MS on increasing soil organic C and nutrient availability. We conclude that a combination of a moderate rate of fertilization and understory replacement with legume species should be adopted to increase soil C sequestration, maintain soil fertility and sustainably develop chestnut plantations.
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