Agrosystems, Geosciences & Environment最新文献_第8页

Developing a simple soil erosion model including spatial variability in headwater catchments 建立一个包含水源集水区空间变异的简单土壤侵蚀模型

IF 1.5

Agrosystems, Geosciences & Environment Pub Date : 2026-03-31 DOI: 10.1002/agg2.70347

Binyam Alemu Yosef, Takashi Gomi, Mitsuru Ohira, Yoshimi Uchiyama, Katsushige Shiraki

{"title":"Developing a simple soil erosion model including spatial variability in headwater catchments","authors":"Binyam Alemu Yosef, Takashi Gomi, Mitsuru Ohira, Yoshimi Uchiyama, Katsushige Shiraki","doi":"10.1002/agg2.70347","DOIUrl":"https://doi.org/10.1002/agg2.70347","url":null,"abstract":"Hillslopes and stream channels are tightly linked in headwater catchments, where soil erosion on slopes is transported to channels depending on topography, soil properties, and ground cover conditions. Because these environments are highly spatially variable, geographic information system (GIS)-based modeling approaches are effective for estimating soil erosion. This study therefore aimed to (1) examine the factors influencing ground cover conditions in relation to overstory structure and topography and (2) develop a simple model and test its applicability for estimating soil erosion in forested headwater catchments. The study was conducted in two catchments, No. 3 (7 ha) and No. 4 (5 ha), located in the Tanzawa Mountains of eastern Kanagawa prefecture, Japan. The Revised Universal Soil Loss Equation was applied using LiDAR-derived topographic data to estimate soil loss from 2010 to 2020. Estimated soil erosion in catchment No. 3 ranged from 0.32 to 3.47 ton ha−1 year−1 (mean 1.25), while values in catchment No. 4 ranged from 0.22 to 2.44 ton ha−1 year−1 (mean 0.85). The results showed that spatial variability, particularly in ground cover, is essential for parameterizing catchment-scale soil erosion models. The model achieved about 50% effectiveness during moderate rainfall and long monitoring periods but underestimated erosion by 31%–48% during short periods with intense rainfall. Overall, the study demonstrates that including spatially distributed understory conditions shaped by canopy structure and topography improves soil erosion modeling. The proposed model offers practical value for revising soil and water conservation guidelines. These findings highlight the importance of integrating fine-scale vegetation and terrain dynamics in future erosion assessments and monitoring.","PeriodicalId":7567,"journal":{"name":"Agrosystems, Geosciences & Environment","volume":"9 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://acsess.onlinelibrary.wiley.com/doi/epdf/10.1002/agg2.70347","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 1.5

Agrosystems, Geosciences & Environment Pub Date : 2026-03-31

引用次数: 0

IF 1.5

Agrosystems, Geosciences & Environment Pub Date : 2026-03-31

引用次数: 0

IF 1.5

Agrosystems, Geosciences & Environment Pub Date : 2026-03-31

引用次数: 0

Differential response of Palmer amaranth (Amaranthus palmeri) seed germination and seedling emergence under variable environmental conditions 不同环境条件下苋菜种子萌发和出苗的差异响应

IF 1.5

Agrosystems, Geosciences & Environment Pub Date : 2026-03-31 DOI: 10.1002/agg2.70350

Sithin Mathew, Sudip Regmi, Aniruddha Maity, Yogendra Raj Upadhyaya, Olumide Samuel Daramola, Pratap Devkota

{"title":"Differential response of Palmer amaranth (Amaranthus palmeri) seed germination and seedling emergence under variable environmental conditions","authors":"Sithin Mathew, Sudip Regmi, Aniruddha Maity, Yogendra Raj Upadhyaya, Olumide Samuel Daramola, Pratap Devkota","doi":"10.1002/agg2.70350","DOIUrl":"https://doi.org/10.1002/agg2.70350","url":null,"abstract":"Palmer amaranth (Amaranthus palmeri S. Watson) is a eudicot weed that is considered as one of the most problematic weed species. It is reported to overcome several environmental and management stresses under field conditions. Research was conducted in a growth chamber and greenhouse to evaluate the effects of different stress parameters such as temperature, pH, light availability, salinity, osmotic stress, cover crop residue, and soil moisture on seed germination in Palmer amaranth. Seed germination was higher at alternating temperatures of 35°C/25°C and 25°C/15°C (83% and 56%, respectively) compared to 45°C/35°C and 15°C/5°C (˂1%). A pH change of 3–11 and varying light and dark hours did not significantly influence seed germination. A decrease in seed germination was observed from 79% to 57% with the increase in salt concentration from 0 to 50 mM. Similarly, germination was highest at 0 MPa (78%), but it dropped by nearly half to 40% with an increase in osmotic stress to −0.1 MPa. A lower rate of cereal rye cover crop residue (2 t ha−1) recorded greater seedling emergence compared to no cover crop. Varying levels of soil moisture also influenced seedling emergence, in which 100% and 75% field capacity (FC) produced maximum seedling emergence (85% each), followed by a 37% seedling emergence at 50% FC. The ability to emerge under high salinity and a wide range of pH along with the high invasive tendency makes Palmer amaranth a troublesome weed.","PeriodicalId":7567,"journal":{"name":"Agrosystems, Geosciences & Environment","volume":"9 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://acsess.onlinelibrary.wiley.com/doi/epdf/10.1002/agg2.70350","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction to “Performance evaluation of early-maturing sorghum [Sorghum bicolor (L.) Moench] for the moisture-deficit areas of Amhara region, Ethiopia” 对“早熟高粱[高粱双色（L.）]的性能评价”的更正埃塞俄比亚阿姆哈拉地区的缺水地区。”

IF 1.5

Agrosystems, Geosciences & Environment Pub Date : 2026-03-31 DOI: 10.1002/agg2.70357

引用次数: 0

IF 1.5

Agrosystems, Geosciences & Environment Pub Date : 2026-03-31

引用次数: 0

IF 1.5

Agrosystems, Geosciences & Environment Pub Date : 2026-03-27

引用次数: 0

IF 1.5