【摘要】：通過添加土壤原總磷(TP)0~60%的過磷酸鈣和室內(nèi)培養(yǎng)的技術(shù)手段,研究了外源磷素輸入對農(nóng)區(qū)濕地土壤碳庫有效性及其周轉(zhuǎn)特性的動態(tài)影響。結(jié)果表明,隨外源磷素輸入水平的增加,土壤可溶性有機(jī)碳(DOC)含量和微生物量碳(MBC)含量增加;土壤總有機(jī)碳(TOC)含量下降,下降率最高達(dá)23%�；钚杂袡C(jī)碳成分中,外源磷輸入對高活性有機(jī)碳(HLOC)影響最顯著,60%磷素輸入處理HLOC含量比未施加外源磷素高54%;易氧化有機(jī)碳(ROC)含量隨外源磷輸入水平的增加而下降,最大下降率為22%;中活性有機(jī)碳(MLOC)含量、活性有機(jī)碳(LOC)含量無明顯改變。涉碳循環(huán)生物酶中,β-葡聚糖苷酶(βG)和纖維二糖水解酶(CBH)活性均隨外源磷素輸入水平的增加而顯著提升,但脫氫酶(DH)活性并無顯著變化。此外,土壤碳礦化強(qiáng)度和潛在礦化勢也與外源磷素輸入后的土壤TP呈正相關(guān)�？傮w來看,外源磷素輸入顯著增加了濕地土壤碳庫的有效性及周轉(zhuǎn)速率。
[Abstract]:The dynamic effects of exogenous phosphorus input on carbon pool availability and turnover characteristics of wetland soil in agricultural areas were studied by adding 60% original total phosphorus (TP) superphosphate and laboratory culture techniques. The results showed that the content of soluble organic carbon (DOC) and microbial biomass carbon (MBC) increased with the increase of exogenous phosphorus input, and the content of total organic carbon (TOC) decreased with the highest rate of 23%. Among the active organic carbon components, exogenous phosphorus input had the most significant effect on the (HLOC) content of high active organic carbon (HLOC). The content of HLOC in the 60% phosphorus input treatment was 54% higher than that in the control group, and the (ROC) content of easily oxidized organic carbon decreased with the increase of the exogenous phosphorus input level. The maximum decrease rate was 22. The content of (MLOC) and (LOC) did not change significantly. The activities of 尾 -glucanase (尾 G) and cellobiose hydrolase (CBH) increased significantly with the increase of exogenous phosphorus input level, but the activity of dehydrogenase (DH) did not change significantly. In addition, the soil carbon mineralization intensity and potential mineralization potential were positively correlated with soil TP after exogenous phosphorus input. In general, exogenous phosphorus input significantly increased the availability and turnover rate of soil carbon pool in wetlands.
【作者單位】： 浙江大學(xué)環(huán)境與資源學(xué)院;杭州市余杭區(qū)農(nóng)業(yè)生態(tài)與植物保護(hù)管理總站;浙江省林業(yè)科學(xué)研究院生態(tài)研究所;杭州谷勝農(nóng)業(yè)科技有限公司;
【基金】：國家自然科學(xué)基金項目(41373073,41371447) 浙江省科技計劃項目(2015F5002)資助~~
【分類號】：S153.6

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