دورية أكاديمية
Alterations of ecosystem nitrogen status following agricultural land abandonment in the Karst Critical Zone Observatory (KCZO), Southwest China
| العنوان: | Alterations of ecosystem nitrogen status following agricultural land abandonment in the Karst Critical Zone Observatory (KCZO), Southwest China |
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| المؤلفون: | Man Liu, Guilin Han |
| المصدر: | PeerJ, Vol 11, p e14790 (2023) |
| بيانات النشر: | PeerJ Inc., 2023. |
| سنة النشر: | 2023 |
| المجموعة: | LCC:Medicine LCC:Biology (General) |
| مصطلحات موضوعية: | Soil N availability, NO3– loss potential, 15N natural abundance, Soil aggregates, Secondary succession, Karst critical zone observatory, Medicine, Biology (General), QH301-705.5 |
| الوصف: | Background Secondary succession after agricultural land abandonment generally affects nitrogen (N) cycle processes and ecosystem N status. However, changes in soil N availability and NO3– loss potential following secondary succession are not well understood in karst ecosystems. Methods In the Karst Critical Zone Observatory (KCZO) of Southwest China, croplands, shrub-grass lands, and secondary forest lands were selected to represent the three stages of secondary succession after agricultural land abandonment by using a space-for-time substitution approach. The contents and 15N natural abundance (δ15N) of leaves, soils, and different-sized aggregates at the three stages of secondary succession were analyzed. The δ15N compositions of soil organic nitrogen (SON) in aggregates and soil to plant 15N enrichment factor (EF = δ15Nleaf −δ15Nsoil), combined with soil inorganic N contents and δ15N compositions were used to indicate the alterations of soil N availability and NO3–loss potential following secondary succession. Results Leaf N content and SON content significantly increased following secondary succession, indicating N accumulation in the soil and plant. The δ15N values of SON also significantly decreased, mainly affected by plant δ15N composition and N mineralization. SON content in macro-aggregates and soil NH4+ content significantly increased while δ15N values of NH4+ decreased, implying increases in SON stabilization and improved soil N availability following secondary succession. Leaf δ15N values, the EF values, and the (NO3–-N)/(NH4+-N) ratio gradually decreased, indicating reduced NO3– loss following secondary succession. Conclusions Soil N availability improves and NO3– leaching loss reduces following secondary succession after agricultural land abandonment in the KCZO. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2167-8359 |
| Relation: | https://peerj.com/articles/14790.pdf; https://peerj.com/articles/14790/; https://doaj.org/toc/2167-8359 |
| DOI: | 10.7717/peerj.14790 |
| URL الوصول: | https://doaj.org/article/e594da520542455b8d5b264b8d7238ae |
| رقم الأكسشن: | edsdoj.594da520542455b8d5b264b8d7238ae |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 21678359 |
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| DOI: | 10.7717/peerj.14790 |