Mathias Becker, Kai Behn, Gereon Heller, Hellen W. Kamiri
{"title":"土壤肥力是藜入侵的原因还是结果？","authors":"Mathias Becker, Kai Behn, Gereon Heller, Hellen W. Kamiri","doi":"10.1002/jpln.202400442","DOIUrl":null,"url":null,"abstract":"<div>\n \n \n <section>\n \n <h3> Background</h3>\n \n <p>For 20 years, <i>Prosopis juliflora</i> is aggressively spreading throughout the “Njemps Flats” in Kenya, where it changes vegetation cover and affects pastoral livelihoods. Its invasion dynamics is related to shallow groundwater tables (<i>Prosopis</i> being a phreatophyte), and it reportedly preferentially colonizes sites with favourable soil fertility attributes.</p>\n </section>\n \n <section>\n \n <h3> Aim</h3>\n \n <p>We contest this latter hypothesis, surmising that the N<sub>2</sub>-fixing ability, the nutrient pumping by the deep root system, and year-round leaf litter fall will improve soil fertility attributes under <i>Prosopis</i>, irrespective of the initial soil status.</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>We assessed stand densities (number of individuals and their percentage cover) and selected soil attributes at 75 sites in the Njemps Flats. The stand densities of <i>Prosopis</i> were visualized by ground-truthed remote-sensed data, and subsequently related to soil fertility attributes. We further determined the isotope signatures (δ<sup>15</sup>N and δ<sup>13</sup>C) of the prevailing (past) C4-dominated pasture and the (current) C3-<i>Prosopis</i> vegetation, as well as at three depths of the topsoil.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>The findings confirm favourable fertility attributes (low EC and high N, C, P, and K contents) being associated with dense <i>Prosopis</i> stands. However, the isotope analysis of the topsoil indicates typical signatures of C4 vegetation in non-invaded pastureland and typical signatures of N<sub>2</sub>-fixing C3-plants in the top 5 cm (but not at deeper layers) of soils in <i>Prosopis</i> stands. <i>Prosopis</i> contributes about 16% of N derived from fixation, and significantly increases C, N, P, and Ca contents of the topsoil.</p>\n </section>\n \n <section>\n \n <h3> Conclusions</h3>\n \n <p>We conclude that high soil fertility is the result rather than the driver of <i>Prosopis</i> invasion.</p>\n </section>\n </div>","PeriodicalId":16802,"journal":{"name":"Journal of Plant Nutrition and Soil Science","volume":"188 2","pages":"232-240"},"PeriodicalIF":2.6000,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jpln.202400442","citationCount":"0","resultStr":"{\"title\":\"Is Soil Fertility the Cause or the Effect of Land Invasion by Prosopis?\",\"authors\":\"Mathias Becker, Kai Behn, Gereon Heller, Hellen W. 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Its invasion dynamics is related to shallow groundwater tables (<i>Prosopis</i> being a phreatophyte), and it reportedly preferentially colonizes sites with favourable soil fertility attributes.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Aim</h3>\\n \\n <p>We contest this latter hypothesis, surmising that the N<sub>2</sub>-fixing ability, the nutrient pumping by the deep root system, and year-round leaf litter fall will improve soil fertility attributes under <i>Prosopis</i>, irrespective of the initial soil status.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Methods</h3>\\n \\n <p>We assessed stand densities (number of individuals and their percentage cover) and selected soil attributes at 75 sites in the Njemps Flats. The stand densities of <i>Prosopis</i> were visualized by ground-truthed remote-sensed data, and subsequently related to soil fertility attributes. We further determined the isotope signatures (δ<sup>15</sup>N and δ<sup>13</sup>C) of the prevailing (past) C4-dominated pasture and the (current) C3-<i>Prosopis</i> vegetation, as well as at three depths of the topsoil.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Results</h3>\\n \\n <p>The findings confirm favourable fertility attributes (low EC and high N, C, P, and K contents) being associated with dense <i>Prosopis</i> stands. 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Is Soil Fertility the Cause or the Effect of Land Invasion by Prosopis?
Background
For 20 years, Prosopis juliflora is aggressively spreading throughout the “Njemps Flats” in Kenya, where it changes vegetation cover and affects pastoral livelihoods. Its invasion dynamics is related to shallow groundwater tables (Prosopis being a phreatophyte), and it reportedly preferentially colonizes sites with favourable soil fertility attributes.
Aim
We contest this latter hypothesis, surmising that the N2-fixing ability, the nutrient pumping by the deep root system, and year-round leaf litter fall will improve soil fertility attributes under Prosopis, irrespective of the initial soil status.
Methods
We assessed stand densities (number of individuals and their percentage cover) and selected soil attributes at 75 sites in the Njemps Flats. The stand densities of Prosopis were visualized by ground-truthed remote-sensed data, and subsequently related to soil fertility attributes. We further determined the isotope signatures (δ15N and δ13C) of the prevailing (past) C4-dominated pasture and the (current) C3-Prosopis vegetation, as well as at three depths of the topsoil.
Results
The findings confirm favourable fertility attributes (low EC and high N, C, P, and K contents) being associated with dense Prosopis stands. However, the isotope analysis of the topsoil indicates typical signatures of C4 vegetation in non-invaded pastureland and typical signatures of N2-fixing C3-plants in the top 5 cm (but not at deeper layers) of soils in Prosopis stands. Prosopis contributes about 16% of N derived from fixation, and significantly increases C, N, P, and Ca contents of the topsoil.
Conclusions
We conclude that high soil fertility is the result rather than the driver of Prosopis invasion.
期刊介绍：
Established in 1922, the Journal of Plant Nutrition and Soil Science (JPNSS) is an international peer-reviewed journal devoted to cover the entire spectrum of plant nutrition and soil science from different scale units, e.g. agroecosystem to natural systems. With its wide scope and focus on soil-plant interactions, JPNSS is one of the leading journals on this topic. Articles in JPNSS include reviews, high-standard original papers, and short communications and represent challenging research of international significance. The Journal of Plant Nutrition and Soil Science is one of the world’s oldest journals. You can trust in a peer-reviewed journal that has been established in the plant and soil science community for almost 100 years.
Journal of Plant Nutrition and Soil Science (ISSN 1436-8730) is published in six volumes per year, by the German Societies of Plant Nutrition (DGP) and Soil Science (DBG). Furthermore, the Journal of Plant Nutrition and Soil Science (JPNSS) is a Cooperating Journal of the International Union of Soil Science (IUSS). The journal is produced by Wiley-VCH.
Topical Divisions of the Journal of Plant Nutrition and Soil Science that are receiving increasing attention are:
JPNSS – Topical Divisions
Special timely focus in interdisciplinarity:
- sustainability & critical zone science.
Soil-Plant Interactions:
- rhizosphere science & soil ecology
- pollutant cycling & plant-soil protection
- land use & climate change.
Soil Science:
- soil chemistry & soil physics
- soil biology & biogeochemistry
- soil genesis & mineralogy.
Plant Nutrition:
- plant nutritional physiology
- nutrient dynamics & soil fertility
- ecophysiological aspects of plant nutrition.
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