Lei Jichu,Liu Xiaowei,Deng Jun,et al.Characteristics of Changes in Soil Enzyme Activities and Stoichiometric Under Different Abandoned Years in the Dry Area of Northern Weihe River Basin[J].Research of Soil and Water Conservation,2024,31(01):44-52.[doi:10.13869/j.cnki.rswc.2024.01.041]
渭北旱塬不同年限撂荒地土壤酶活性及其化学计量变化特征
- Title:
- Characteristics of Changes in Soil Enzyme Activities and Stoichiometric Under Different Abandoned Years in the Dry Area of Northern Weihe River Basin
- 文章编号:
- 1005-3409(2024)01-0044-09
- Keywords:
- arid area of northern Weihe River Basin; different abandoned years; soil enzymatic activity; ecological stoichiometry
- 分类号:
- X144
- 文献标志码:
- A
- 摘要:
- [目的]探究渭北旱塬区不同年限撂荒地的土壤养分、胞外酶活性及其化学计量的变化特征及影响因素,以期为渭北旱塬区撂荒地的改善与管理提供一定的理论依据。[方法]以渭北旱塬不同年限(5 a,10 a,20 a,25 a和33 a)的撂荒地为研究对象,测定了土壤养分和参与土壤碳(C)、氮(N)和磷(P)循环的5种胞外酶活性,随后利用单因素方差分析、土壤胞外酶化学计量学模型和主坐标分析(PCoA)研究不同撂荒年限下土壤养分和胞外酶活性及其生态化学计量的变化规律及影响因子。[结果]随着撂荒年限的增加,土壤C和N获取酶活性显著减小,而P获取酶活性显著增加; 土壤C、N和P含量变化与酶活性变化趋势相反。随撂荒年限延长,土壤微生物的C限制得到缓解,P限制逐渐加强。PCoA拟合环境因子分析结果显示:土壤可溶性有机碳(DOC)、总磷(TP)、速效氮(AN)和速效磷(AP)含量是驱动酶活性及其计量比变化的关键因子。[结论]撂荒对土壤养分状况具有显著改善作用,但随撂荒时间延长(20 a以上)会加剧微生物P限制,因此对经过长年撂荒的土地应当适量施用磷肥,以改善其土壤状况。
- Abstract:
- [Objective] This study aims to explore the variations and drivers of soil nutrient and extracellular enzyme activities and their stoichiometric characteristics under the abandoned land in the dry area of Northern Weihe River Basin in order to provide a theoretical basis for the improvement and management of abandoned land in this region. [Methods] Soil nutrients and enzyme activities associated with carbon(C), nitrogen(N), and phosphorus(P)cycles in the lands with different abandoned years(5 years, 10 years, 20 years, 25 years and 33 years)in dry area of Northern Weihe River Basin were measured. Subsequently, The changes and driver factors of them and their stoichiometry were determined by One-way ANOVA, enzyme stoichiometric model, and principal coordinate analysis(PCoA). [Results] With the increase of abandoned years, the activities of C-acquiring enzymes and N-acquiring enzymes decreased, but the activity of P-acquiring enzymes significantly increased. The changes of soil C, N and P contents showed the opposite trend compared with enzyme activities. Moreover, the C-limitation of soil microorganisms alleviated but P-limitation increased with the increase of abandoned years. Further, the results of PCoA fitting environmental factor analysis showed that soil dissolved organic carbon, total phosphorus, available nitrogen and available phosphorus were the key factors driving the change of enzyme activity and its econometric ratio. [Conclusion] Abandonment has a significant improvement on soil nutrient, but P-limited will be aggravated with increasing of abandoned years(more than 20 years). Therefore, appropriate phosphate fertilizer should be applied to a long-term abandoned land to improve its soil condition.
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备注/Memo
收稿日期:2023-03-02 修回日期:2023-05-07
资助项目:国家自然科学基金(41701606); 陕西省自然科学基础研究计划(2021JM-093); 中央高校基本科研业务费(2452020009)资助
第一作者:雷跻初(1998—),女,陕西大荔人,硕士研究生,研究方向为草地生态学。E-mail:jcljc1998@163.com
通信作者:郭梁(1984—),男,山东泰安人,博士,研究员,主要从事气候变化与林草生态响应。E-mail:guoliang2014@nwsuaf.edu.cn