干旱区生态环境知识资源中心(Arid): 降水量及N添加对荒漠草原植物和土壤微生物C∶N∶P生态化学计量特征的影响

Arid

	降水量及N添加对荒漠草原植物和土壤微生物C∶N∶P生态化学计量特征的影响
其他题名	Effects of Precipitation and N Addition on Plant and Microbial C∶N∶P Ecological Stoichiometry in a Desert Steppe of Northwestern China
	朱湾湾; 许艺馨; 王攀; 余海龙; 黄菊莹
来源期刊	西北植物学报
ISSN	1000-4025
出版年	2020
卷号	40 期号:4 页码:676-687
中文摘要	基于2017年在宁夏荒漠草原设立的降水量(减少50%、减少30%、自然降水、增加30%以及增加50%)和N添加(0和5g·m~(-2)·a~(-1))野外试验,研究了植物和土壤微生物C∶N∶P生态化学计量特征,分析二者与土壤C∶N∶P生态化学计量特征及其他土壤因子的关系,以探讨降水格局改变和大气N沉降增加下荒漠草原植物和土壤微生物C∶N∶P平衡特征及其主要影响因素。结果表明:(1)减少降水量对荒漠草原植物和土壤微生物C∶ N∶P生态化学计量特征的影响较小,反映了二者对短期干旱的适应性;增加降水量降低了植物和土壤微生物生物量N和P含量,不同程度地提高了C∶N和C∶P,但其影响程度与N添加有关。(2)增减降水量条件下,N添加对植物生态化学计量特征影响较小,但对土壤微生物C∶N∶P生态化学计量特征影响较大,尤其在增加降水量条件下表现得更明显,意味着降水激发了N添加效应。(3)植物全N含量、N∶P以及土壤微生物生物量N含量的内稳性较低,可较好地反映土壤N供给水平以及N、P受限类型。(4)与植物C∶N∶P生态化学计量特征关系较强的土壤因子为速效P含量、磷酸酶活性、电导率、C∶P和有机C含量,与土壤微生物C∶N∶P生态化学计量特征关系较强的土壤因子有电导率、含水量、蔗糖酶活性和磷酸酶活性,表明植物和土壤微生物C∶N∶P平衡特征主要受其他土壤因子的调控,而非土壤元素平衡关系。
英文摘要	Based on a field experiment involving five precipitation treatments(50%reduction,30%reduction, control,30%increase,and 50%increase)and two N addition treatments(0and 5g·m~(-2)·a~(-1)) conducted in a desert steppe of Ningxia in 2017,the C∶N∶P ecological stoichiometry in both plants and soil microbes were studied,and their relationships with soil C∶N∶P ecological stoichiometry and other indices were also analyzed.Our main objectives were to determine the C∶N∶P balance characteristics both in plants and soil microbes and their key influencing factors.The results showed that:(1)decreasing precipitation had little effects on the C∶N∶P stoichiometry in both plants and soil microbes,reflecting their adaptations to short-term drought;increasing precipitation decreased N and P contents in both plants and soil microbes,and thus increased C∶N and C∶P.However,these effects were simultaneously influenced by N addition.(2)Under reduced and increased precipitation conditions,N addition had less effect on plant C∶N∶P stoichiometry,whereas it greatly changed soil microbial C∶N∶P stoichiometry,especially under increased precipitation treatments,indicating that precipitation promotes the effect of N addition.( 3)Compared with other indices,plant total N content and N∶P and soil microbial biomass N∶P had lower internal stabilities,indicating that these indices could better reflect the N supply and N and P limitation in soils.(4)Among all soil factors,plant C∶N∶P stoichiometry was more affected by available P concentration,phosphatase activity,conductivity,C∶P and organic C content,while soil microbial C∶ N∶P ecological stoichiometry more tightly related to conductivity,water content,sucrase activity,and phosphatase activity,indicating that the C∶N∶P ecological stoichiometry of plants and soil microbes are mainly regulated by other soil factors,rather than soil C∶N∶P ecological stoichiometry.
中文关键词	荒漠草原 ; 降水格局改变 ; 大气N沉降增加 ; 生态化学计量学 ; 元素内稳性 ; 土壤性质
英文关键词	desert steppe changing precipitation regimes increasing atmospheric N deposition ecological stoichiometry elemental homeostasis soil properties
类型	Article
语种	中文
收录类别	CSCD
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6739472
来源机构	宁夏大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336557
作者单位	朱湾湾, 宁夏大学资源环境学院;;宁夏大学环境工程研究院, ;;, 银川;;银川, ;; 750021;;750021.; 许艺馨, 宁夏大学资源环境学院;;宁夏大学环境工程研究院, ;;, 银川;;银川, ;; 750021;;750021.; 王攀, 宁夏大学资源环境学院;;宁夏大学环境工程研究院, ;;, 银川;;银川, ;; 750021;;750021.; 余海龙, 宁夏大学资源环境学院, 银川, 宁夏 750021, 中国.; 黄菊莹, 宁夏大学环境工程研究院, 银川, 宁夏 750021, 中国.
推荐引用方式 GB/T 7714	朱湾湾,许艺馨,王攀,等. 降水量及N添加对荒漠草原植物和土壤微生物C∶N∶P生态化学计量特征的影响[J]. 宁夏大学,2020,40(4):676-687.
APA	朱湾湾,许艺馨,王攀,余海龙,&黄菊莹.(2020).降水量及N添加对荒漠草原植物和土壤微生物C∶N∶P生态化学计量特征的影响.西北植物学报,40(4),676-687.
MLA	朱湾湾,et al."降水量及N添加对荒漠草原植物和土壤微生物C∶N∶P生态化学计量特征的影响".西北植物学报 40.4(2020):676-687.