Contrastive effects of inorganic phosphorus addition on soil microbial respiration and microbial biomass in tropical monoculture tree plantation soils in Thailand
Contrastive effects of inorganic phosphorus addition on soil microbial respiration and microbial biomass in tropical monoculture tree plantation soils in Thailand
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DOI：
10.1016/j.anres.2016.04.004
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发表时间：
2016-09
影响因子：
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通讯作者：
Taiki Mori;C. Wachrinrat;D. Staporn;Ponthep Meunpong;Warawich Suebsai;K. Matsubara;Khitja Boonsri;Warisa Lumban;Manassawee Kuawong;Thanida Phukdee;Juruwan Srifai;K. Boonman
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文献类型：
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作者：
Taiki Mori;C. Wachrinrat;D. Staporn;Ponthep Meunpong;Warawich Suebsai;K. Matsubara;Khitja Boonsri;Warisa Lumban;Manassawee Kuawong;Thanida Phukdee;Juruwan Srifai;K. Boonman
通过室内培养试验，研究了无机磷对热带单一树种种植园土壤微生物活性的影响。从泰国Nakhon Ratchasima的一个实验种植园点采集的土壤，在将持水量调节至80%后，每克土壤添加和不添加100 μg P（KH2PO4）培养48 h。在培养过程中，氯仿熏蒸法测得的微生物生物量碳（MBC）含量呈下降趋势，添加磷显著促进了MBC含量的下降。另一方面，磷的添加增加了溶解有机碳（DOC）含量和CO2排放量。研究表明，施磷改变了土壤微生物的活性，可能包括土壤微生物群落的变化。此外，研究表明，增加磷刺激土壤呼吸不一定伴随着增加MBC。磷限制对土壤微生物活性的影响的评估应至少测量磷添加对土壤呼吸和MBC的影响，可能结合土壤微生物群落分析。
An incubation experiment was conducted to test the effects of inorganic phosphorus (P) addition on soil microbial activities in tropical monoculture tree plantation soils. The soils taken from an experimental tree plantation site in Nakhon Ratchasima, Thailand were incubated for 48 h with and without adding 100 μg of P (KH2PO4) per gram soil after adjusting the water holding capacity to 80%. During the incubation period, the microbial biomass carbon (MBC) contents determined using the chloroform fumigation extraction method decreased and P addition stimulated the decreased rate significantly. On the other hand, the P addition increased the dissolved organic carbon (DOC) contents and CO2emissions. The study suggested that P addition had changed soil microbial activities, possibly including a soil microbial community change. Furthermore, the study showed that the stimulated soil respiration by P addition is not necessarily accompanied by increased MBC. The assessment of the effects of P limitation on soil microbial activities should measure at least the effects of P addition on both soil respiration and MBC, possibly combined with soil microbial community analyses.