Soil quality indices following long-term conservation pasture management practices

被引：31

作者：

Amorim, Helen C. S. ^{[1
,2
,3
]}

Ashworth, Amanda J. ^{[1
]}

Moore, Philip A., Jr. ^{[1
]}

Wienhold, Brian J. ^{[4
]}

Savin, Mary C. ^{[2
]}

Owens, Phillip R. ^{[5
]}

Jagadamma, Sindhu ^{[6
]}

Carvalho, Teotonio S. ^{[3
]}

Xu, Sutie ^{[6
]}

机构：

[1] Univ Arkansas, Poultry Prod & Prod Safety Res Unit, USDA ARS, O303 Poultry Sci Ctr, Fayetteville, AR 72701 USA

[2] Univ Arkansas, Crop Soil & Environm Sci, 115 Plant Sci Bldg, Fayetteville, AR 72701 USA

[3] Univ Fed Lavras, Soil Sci, 1001 Av Doutor Silvio Menicucci, BR-37200000 Lavras, MG, Brazil

[4] Univ Nebraska, Agroecosyst Management Res Unit, USDA ARS, 251 Filley Hall,East Campus, Lincoln, NE 68583 USA

[5] USDA ARS, Dale Bumpers Small Farms Res Ctr, 6883 South Highway 23, Booneville, AR 72927 USA

[6] Univ Tennessee, Biosyst Engn & Soil Sci, 2506 EJ Chapman Dr, Knoxville, TN 37996 USA

来源：

AGRICULTURE ECOSYSTEMS & ENVIRONMENT | 2020年 / 301卷

关键词：

Soil health; Best management practices; Continuous grazing; Rotational grazing; Buffer strips; Nutrient runoff; CATTLE MANURE APPLICATION; ASSESSMENT FRAMEWORK SMAF; GRAZING MANAGEMENT; WATER-QUALITY; CROPPING SYSTEMS; BUFFER STRIPS; PHOSPHORUS; RUNOFF; IMPACTS; VEGETATION;

D O I：

10.1016/j.agee.2020.107060

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

Monitoring long-term grazing management practices influence on soil quality (SQ) is essential to ensuring pasture sustainability, which is the largest land use in world agroecosystems. The aim of this study was to quantify SQ based on long-term (15-years) conservation pasture management and landscape position using the Soil Management Assessment Framework (SMAF). Treatments were setup in 15 watersheds (0.14 ha each, 8% slope) in a completely randomized design with five pasture management practices: continuously grazed (CG), hayed (H), rotationally grazed (R), rotationally grazed with an unfertilized buffer strip (RB), and rotationally grazed with an un-grazed, unfertilized, and fenced riparian strip (RBR). Each watershed was divided in three zones (A, B, and C), with the riparian buffer strip (RBS) corresponding to the RBR D zone. Selected soil chemical, physical, and biological properties were determined on soil samples collected in 2017 (0 -15 cm depth) per zone. Total P, organic C, and total suspended solids (TSS) were measured in 2017 runoff samples. The SMAF SQ scores were evaluated individually and as an overall SQ index (SQI). Exponential models were used to investigate the relationship between SQI and total P, organic C runoff, and TSS loads. Continuously grazed watersheds had improved soil fertility, with greater nutrient concentration at the shoulder landscape position (zone A). Degradation of soil physical properties were not observed for this practice. After 15 years of continuous management, CG and R watersheds had the greatest SQI (7.07 and7.05, respectively), not differing from RBR (6.93), likely owing to cattle manure deposition for these treatments. Increased SQI in RBS (7.33) improved SQI for RBR watersheds. Differences in SQI were mostly driven by changes in pH, electrical conductivity, soil P and K concentrations. The exponential models indicated that 34 and 28 % of the variation in P and TOC runoff loads, respectively, can be explained by the SMAF SQI (p < 0.05). Overall, SMAF identified the impacts of long-term pasture management practices on SQ and the contributions of individual indicators, thus identifying potential benefits of conservation pasture management.

引用

页数：10

共 68 条

[51] DEPENDENCE OF RUNOFF PHOSPHORUS ON EXTRACTABLE SOIL-PHOSPHORUS [J].