| Effects of ridge and furrow mulching and phosphorus application on the ecological stoichiometry of soil\|plant\|microorganism system in alfalfa field |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2025.05.15 |
| Key Words: ridge and furrow mulching phosphorus application Medicago sativa L. soil\|plant\|microorganism system ecological stoichiometry |
| Author Name | Affiliation | | XU Qiuyun | College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai 810016, China | | ZHOU Weidi | College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai 810016, China
Academy of Agriculture and Forestry Sciences, Qinghai University, Xining, Qinghai 810016, China | | HAN Chenglong | State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, Qinghai 810016, China | | GU Yanjie | College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai 810016, China | | LI Fengmin | College of Agriculture, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China |
|
| Hits: 557 |
| Download times: 195 |
| Abstract: |
| From 2011 to 2016, the alfalfa artificial grassland was used as the research object in Zhonglianchuan village, Yuzhong County, Gansu Province. The randomized block of split\|plot design was used. Two mulching methods (no mulching with flat planting and mulching with ridge and furrow) and four phosphorus application gradients (P0: no P applied, P1: apply 9.73 kg·hm-2 phosphorus, P2: apply 19.3 kg·hm-2 phosphorus, and P3: apply 28.9 kg·hm-2 phosphorus) were set up. During the period, soil and aboveground plant samples were collected every year to analyze the C, N, and P content of the soil\|plant\|microorganism system and their ecological stoichiometric characteristics. The results showed that, (1) In addition to high P treatment (P3), plastic film mulch with ridge and furrow averagely increased soil C, N, C∶N, C∶P, N∶P, soil microbial biomass C contents, C∶N, and C∶P by 39.3%, 27.1%, 13.5%, 55.3%, 49.8%, 57.6%, 39.6%, and 43.3%, respectively, compared to no mulching with flat planting. Soil available P under mulching with ridge and furrow averagely decreased by 13.9%, compared to no mulching with flat planting. (2) Soil C, C∶N, plant N, soil microbial biomass C, C∶N, and C∶P increased with increasing P levels in no mulching with flat planting but increased initially and then decreased with the increasing P levels under mulching with ridge and furrow. (3) Plant C∶N and soil microbial biomass nitrogen (MBN) in P1, P2 and P3 treatments decreased by 2.94%, 7.02%, 11.5% and 8.62%, 11.5%, 19.1%, respectively, compared to P0 in no plastic film mulch with flat planting. Plant C∶N and MBN in P1 treatment decreased by 10.0% and 24.3% respectively compared to P0, while in P3 treatment increased by 8.20%, 5.93% and 27.4%, 9.92%, respectively, compared to P1 and P2 under mulching with ridge and furrow. (4) P fertilization respectively increased soil, plant, and soil microbial biomass P by 67.2% to 164.0%, 14.0% to 34.3%, and 19.2% to 87.0%, and respectively decreased soil C∶P and N∶P, plant C∶P and N∶P, and soil microbial biomass N∶P by 29.5% to 51.5%, 30.1% to 54.3%, 13.2% to 28.3%, 6.71% to 19.8%, and 29.1% to 52.7%. (5) With the extension of planting years, by 2016, soil C, N, C∶N, plant N : P, and soil microbial biomass C∶P had cumulatively increased by 49.3%、33.9%、11.3%、77.6% , and 126.0%, respectively compared to 2011, while plant phosphorus content had cumulatively decreased by 51.3%. ]In summary, the growth of alfalfa and soil microorganisms was limited by N deficiency under mulching with ridge and furrow and a high amount of P fertilizer. This management practice accelerated the decomposition of soil organic matter, which was not conducive to maintaining the growth of alfalfa and soil fertility in the semi\|arid region of the Loess Plateau. Therefore, when the amount of P applied under mulching with ridge and furrow is higher than 22.7 kg·hm-2, appropriate nitrogen fertilizer should be supplied. |
|
|
|