Ye Wen-Pei, Wang Kai-Rong, Johnson S E, Xie Xiao-Li
Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.
Ying Yong Sheng Tai Xue Bao. 2008 Feb;19(2):345-50.
A greenhouse incubation test was conducted to study the effects of amendment with different amounts of maize and rice straws on the soil pH, CO2, and exchangeable NH4+ under continuous flooded condition. The results showed that in a near-neutral soil, straw amendment could decrease soil pH, with a significant difference (P < 0.05) between the treatments of 4 g straws x kg(-1) and control (CK), but no significant difference (P > 0.05) between the treatments of 1 g straws x kg(-1) and CK. The CO2 content in soil solution increased with increasing rate of straw amendment, with the peak value being 35.9% and 31.9% (v/v) in the treatments of 1 g maize straw x kg(-1) and 1 g rice straw x kg(-1), respectively. These two treatments had significantly higher CO2 contents (P < 0.05) than CK, but no obvious difference between themselves (P > 0.05). In treatments 4 g maize straw x kg(-1) and 4 g rice straw x kg(-1), the peak value of CO2 content was 54.2% and 41.8% (v/v), respectively, being significantly higher than that of CK (P < 0.01), and significantly different between themselves (P < 0.05). Under non-N fertilization, soil NH4+-N concentration decreased after straw amendment, and the increase of the amendment rate caused a further decrease of soil NH4+-N concentration, with a significant difference (P < 0.05) between the doses of 1 and 4 g straw x kg(-1). Under N fertilization, soil NH4+-N concentration increased after 1 g straw x kg(-1) amendment, but decreased after amendment with 4 g straw x kg(-1). No significant differences were observed between maize straw and rice straw amendment regardless with or without N fertilization (P > 0.05).
进行了温室培养试验，以研究在持续淹水条件下，添加不同量玉米秸秆和水稻秸秆对土壤pH值、二氧化碳和交换性铵离子的影响。结果表明，在近中性土壤中，秸秆添加可降低土壤pH值，4 g秸秆x kg(-1)处理与对照（CK）之间存在显著差异（P < 0.05），但1 g秸秆x kg(-1)处理与CK之间无显著差异（P > 0.05）。土壤溶液中的二氧化碳含量随秸秆添加量的增加而增加，在1 g玉米秸秆x kg(-1)和1 g水稻秸秆x kg(-1)处理中，峰值分别为35.9%和31.9%（v/v）。这两个处理的二氧化碳含量均显著高于CK（P < 0.05），但它们之间无明显差异（P > 0.05）。在4 g玉米秸秆x kg(-1)和4 g水稻秸秆x kg(-1)处理中，二氧化碳含量的峰值分别为54.2%和41.8%（v/v），显著高于CK（P < 0.01），且它们之间存在显著差异（P < 0.05）。在不施氮肥的情况下，秸秆添加后土壤铵态氮浓度降低，添加量增加导致土壤铵态氮浓度进一步降低，1和4 g秸秆x kg(-1)剂量之间存在显著差异（P < 0.05）。在施氮肥的情况下，1 g秸秆x kg(-1)添加后土壤铵态氮浓度增加，但4 g秸秆x kg(-1)添加后降低。无论是否施氮肥，玉米秸秆和水稻秸秆添加之间均未观察到显著差异（P > 0.05）。
