{"title":"了解生态类型、季节性和降雨量减少对巴西热带草原土壤营养状况的交互影响","authors":"","doi":"10.1016/j.foreco.2024.122199","DOIUrl":null,"url":null,"abstract":"<div><p>Climate models forecast a significant reduction in average precipitation and an extension of the dry period over the coming decades, which will likely influence the biogeochemical processes of the Brazilian savanna (i.e. Cerrado). However, studies about the fate of soil nutrient availability in this biome remain scarce. We conducted a field-based experimental rainfall reduction in three Cerrado ecotypes, namely an open savanna (OS), a woodland savanna (WS), and an intermediate savanna (IS), to assess its effects on soil organic matter, total phosphorus, microbial biomass nitrogen, dissolved organic nitrogen and inorganic nitrogen (NH<sub>4</sub><sup>+</sup>-N and NO<sub>3</sub><sup>-</sup>-N) pools in dry and rainy seasons for two consecutive years. Despite sharing common soil origins and climatic conditions, these ecotypes showed contrasting levels of soil organic matter as well as phosphorus and nitrogen pools. The WS showed higher soil fertility with organic matter levels of 11.19 %, P levels of 2.54 mg Kg<sup>−1</sup>, and NO<sub>3</sub><sup>-</sup>-N levels of 2.15 mg Kg<sup>−1</sup>, compared to the OS, which had organic matter levels of 7.04 %, P levels of 0.65 mg Kg<sup>−1</sup>, and NO<sub>3</sub><sup>-</sup>-N levels of 1.49 mg Kg<sup>−1</sup>. The IS showed intermediate values, with organic matter levels of 8.94 %, P levels of 0.65 mg Kg<sup>−1</sup>, and NO<sub>3</sub><sup>-</sup>-N levels of 1.93 mg Kg<sup>−1</sup>. Seasonal patterns considerably influenced soil nutrient content, with higher soil inorganic nitrogen levels typically found during the rainy season and higher soil phosphorous levels during the dry season, although these patterns varied among ecotypes. Soil organic matter, dissolved organic nitrogen, and microbial biomass nitrogen exhibited greater sensitivity to the experimental reduction in rainfall compared to soil phosphorus and inorganic nitrogen. However, this sensitivity varied across ecotypes and seasons, with a particularly strong effect observed in the IS and during the rainy season. Our findings suggest that the effects of climate change in the Cerrado might strongly vary among seasons and the different ecotypes, highlighting the need for more comprehensive experimental studies in the different ecotypes to fully understand future nutrient dynamics in the Cerrado.</p></div>","PeriodicalId":12350,"journal":{"name":"Forest Ecology and Management","volume":null,"pages":null},"PeriodicalIF":3.7000,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Understanding the interactive effects of ecotype, seasonality, and rainfall reduction on the soil nutritional status of the Brazilian savanna\",\"authors\":\"\",\"doi\":\"10.1016/j.foreco.2024.122199\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Climate models forecast a significant reduction in average precipitation and an extension of the dry period over the coming decades, which will likely influence the biogeochemical processes of the Brazilian savanna (i.e. Cerrado). However, studies about the fate of soil nutrient availability in this biome remain scarce. We conducted a field-based experimental rainfall reduction in three Cerrado ecotypes, namely an open savanna (OS), a woodland savanna (WS), and an intermediate savanna (IS), to assess its effects on soil organic matter, total phosphorus, microbial biomass nitrogen, dissolved organic nitrogen and inorganic nitrogen (NH<sub>4</sub><sup>+</sup>-N and NO<sub>3</sub><sup>-</sup>-N) pools in dry and rainy seasons for two consecutive years. Despite sharing common soil origins and climatic conditions, these ecotypes showed contrasting levels of soil organic matter as well as phosphorus and nitrogen pools. The WS showed higher soil fertility with organic matter levels of 11.19 %, P levels of 2.54 mg Kg<sup>−1</sup>, and NO<sub>3</sub><sup>-</sup>-N levels of 2.15 mg Kg<sup>−1</sup>, compared to the OS, which had organic matter levels of 7.04 %, P levels of 0.65 mg Kg<sup>−1</sup>, and NO<sub>3</sub><sup>-</sup>-N levels of 1.49 mg Kg<sup>−1</sup>. The IS showed intermediate values, with organic matter levels of 8.94 %, P levels of 0.65 mg Kg<sup>−1</sup>, and NO<sub>3</sub><sup>-</sup>-N levels of 1.93 mg Kg<sup>−1</sup>. Seasonal patterns considerably influenced soil nutrient content, with higher soil inorganic nitrogen levels typically found during the rainy season and higher soil phosphorous levels during the dry season, although these patterns varied among ecotypes. Soil organic matter, dissolved organic nitrogen, and microbial biomass nitrogen exhibited greater sensitivity to the experimental reduction in rainfall compared to soil phosphorus and inorganic nitrogen. However, this sensitivity varied across ecotypes and seasons, with a particularly strong effect observed in the IS and during the rainy season. Our findings suggest that the effects of climate change in the Cerrado might strongly vary among seasons and the different ecotypes, highlighting the need for more comprehensive experimental studies in the different ecotypes to fully understand future nutrient dynamics in the Cerrado.</p></div>\",\"PeriodicalId\":12350,\"journal\":{\"name\":\"Forest Ecology and Management\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.7000,\"publicationDate\":\"2024-08-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Forest Ecology and Management\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0378112724005115\",\"RegionNum\":2,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"FORESTRY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Forest Ecology and Management","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0378112724005115","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"FORESTRY","Score":null,"Total":0}
Understanding the interactive effects of ecotype, seasonality, and rainfall reduction on the soil nutritional status of the Brazilian savanna
Climate models forecast a significant reduction in average precipitation and an extension of the dry period over the coming decades, which will likely influence the biogeochemical processes of the Brazilian savanna (i.e. Cerrado). However, studies about the fate of soil nutrient availability in this biome remain scarce. We conducted a field-based experimental rainfall reduction in three Cerrado ecotypes, namely an open savanna (OS), a woodland savanna (WS), and an intermediate savanna (IS), to assess its effects on soil organic matter, total phosphorus, microbial biomass nitrogen, dissolved organic nitrogen and inorganic nitrogen (NH4+-N and NO3--N) pools in dry and rainy seasons for two consecutive years. Despite sharing common soil origins and climatic conditions, these ecotypes showed contrasting levels of soil organic matter as well as phosphorus and nitrogen pools. The WS showed higher soil fertility with organic matter levels of 11.19 %, P levels of 2.54 mg Kg−1, and NO3--N levels of 2.15 mg Kg−1, compared to the OS, which had organic matter levels of 7.04 %, P levels of 0.65 mg Kg−1, and NO3--N levels of 1.49 mg Kg−1. The IS showed intermediate values, with organic matter levels of 8.94 %, P levels of 0.65 mg Kg−1, and NO3--N levels of 1.93 mg Kg−1. Seasonal patterns considerably influenced soil nutrient content, with higher soil inorganic nitrogen levels typically found during the rainy season and higher soil phosphorous levels during the dry season, although these patterns varied among ecotypes. Soil organic matter, dissolved organic nitrogen, and microbial biomass nitrogen exhibited greater sensitivity to the experimental reduction in rainfall compared to soil phosphorus and inorganic nitrogen. However, this sensitivity varied across ecotypes and seasons, with a particularly strong effect observed in the IS and during the rainy season. Our findings suggest that the effects of climate change in the Cerrado might strongly vary among seasons and the different ecotypes, highlighting the need for more comprehensive experimental studies in the different ecotypes to fully understand future nutrient dynamics in the Cerrado.
期刊介绍:
Forest Ecology and Management publishes scientific articles linking forest ecology with forest management, focusing on the application of biological, ecological and social knowledge to the management and conservation of plantations and natural forests. The scope of the journal includes all forest ecosystems of the world.
A peer-review process ensures the quality and international interest of the manuscripts accepted for publication. The journal encourages communication between scientists in disparate fields who share a common interest in ecology and forest management, bridging the gap between research workers and forest managers.
We encourage submission of papers that will have the strongest interest and value to the Journal''s international readership. Some key features of papers with strong interest include:
1. Clear connections between the ecology and management of forests;
2. Novel ideas or approaches to important challenges in forest ecology and management;
3. Studies that address a population of interest beyond the scale of single research sites, Three key points in the design of forest experiments, Forest Ecology and Management 255 (2008) 2022-2023);
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