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北方典型设施菜地土壤CO2排放特征
陶宝先
作者单位E-mail
陶宝先 聊城大学 taobaoxian@sina.com 
摘要:
为研究我国北方典型设施菜地的土壤CO2排放特征及其影响因素,通过原位监测手段,研究山东寿光市农田转变为不同种植年限(6、12 a)设施菜地及设施菜地荒废后土壤CO2排放规律及影响因素。结果表明:①种植6 a设施菜地较农田具有较高的土壤CO2排放量,原因可能是设施菜地种植过程中大量施加有机肥,且设施菜地土壤温度及含水率较高,增加了土壤蔗糖酶活性,加剧土壤CO2排放。②当种植年限超过10 a,设施菜地施肥量减少,降低了土壤微生物可利用底物的供应。因此,种植12 a设施菜地土壤CO2排放量降至农田水平。③种植6 a设施菜地土壤较农田具有较高的水溶性有机碳含量。④土壤CO2排放年内分配不均匀:农田及荒废设施菜地土壤CO2排放主要集中在5—8月,其排放量占全年的75.09%、87.02%,峰值出现在7月。种植6 a设施菜地土壤CO2排放主要集中在5—8月和11月—翌年2月,两阶段排放量分别占全年的48.48%、42.34%,峰值分别出现在7、12月。研究显示,农田转变为设施菜地短期内(种植6 a)显著促进土壤CO2排放及水溶性有机碳输出,但随着种植年限延长至12 a,土壤CO2排放下降至农田水平。
关键词:  设施菜地  CO2排放  土壤水热状况  寿光市
DOI:
分类号:
基金项目:国家自然科学青年基金(41501099);山东省自然科学基金(ZR2014DQ015);聊城大学基金(318051430)
TThe CO2 Emissions from Typical Greenhouse Soils in Northern China
Baoxian Tao
Abstract:
In order to study the effects of land use change on CO2 emissions and its influenced factors, we studied the CO2 flux rates and environment factors in the farmland (FL), greenhouse soil that cultivated for 6 a (6GH) and 12 a (12GH) and greenhouse soil that were abandoned (AG). The results showed that: ① there was a highest CO2 emission rates in the soils of 6GH. The more fertilizers, higher soil temperature, and higher soil moisture could increase the soil invertase enzyme activities in this treatment, then increased the CO2 release from soils. ② After more than ten years'' cultivation, the application of organic manure could be reduced in greenhouse. This could decrease the supply of available substrates for microbial decomposition. Then, the annual CO2 emissions in 12GH decreased to the level of FL. ③ The concentrations of dissolved organic carbon (DOC) in 6GH were higher than those in FL. ④ The CO2 emission patterns were different between the treatments. The percentages of CO2 emissions to annual emissions were 75.08% in FL and 87.02% in AG from May to August and peak values of CO2 emission were presented in July in these treatments. CO2 in 6GH were mainly released from May to August (48.48%) and from November to the next February (42.34%) and peak values of CO2 emission were presented in July and December, respectively. In conclusion, the land use change from FL to 6GH would enhance CO2 emission and soil DOC productions. However, CO2 emissions could be decreased with the years of cultivation. After 12 years of cultivation, CO2 emission decreased to the level of FL.
Key words:  Greenhouse cultivation  CO2 emissions  soil temperature and moisture  Shouguang city