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Influence of grazing exclosure on vegetation biomass and soil quality

International Soil and Water Conservation Research 2017年第1期5卷 62-68页

作者： Shagufta Qasim Shamim Gul Maria Hussain Shah Fayyaz Hussain Sarfraz Ahmad Muhammad Islam gulbano rehman Muhammad Yaqoob Syed Qasim Shah Department of Plant Sciences Sardar Bahadur Khan Women UniversityQuettaBalochistanPakistan Department of Botany University of BalochistanSarab roadQuettaBalochistanPakistan Department of Natural Resource Sciences McGill University QCCanada Land Resources Research Institute National Agricultural Research CentrePakistan Agriculture Research CouncilIslamabadPakistan Rangeland Research Centre National Agricultural Research CentrePakistan Agriculture Research CouncilIslamabadPakistan Small Ruminant Production Scientist Diversification&Sustainable Intensification of Production System Program(DSIPSP)International Center for Agriculture Research in Dry Areas(ICARDA)Pakistan OfficeNational Agricultural Research CenterPark RoadIslamabadPakistan Department of Chemistry University of BalochistanQuettaPakistan

This study investigated the influence of sixteen years exclosure from unmanaged grazing on aboveground vegetation biomass,soil organic matter(SOM),soil aggregation and nitrogen(N)mineralization in arid shrubland of Baluchistan,*** was carried out from three sites along the chronosequence of secondary *** site was located at open-for-grazing area(grazed site)and the other two sites were located in the area that is protected since *** of the protected site is more remote from grazing(protected site 1)where the land is less disturbed and has thick vegetation than the other protected site(protected site 2).Results showed a significant difference for aboveground vegetation biomass across sites and was in the order of protected site 1>protected site 2>grazed *** organic matter was 53% and 46% higher in protected sites than grazed *** larger than 2 mm size were not detected in soil from grazed site but represented 4.5% and 3% of the sample soil profile at the protected site 1 and protected site 2,*** of N mineralization was lower in soils at the grazed site as compared to soils at the protected *** moisture contents were significantly lower at grazed site and showed a strong positive correlation with aboveground vegetation *** study demonstrates that unmanaged grazing severely affected aboveground vegetation biomass,soil organic matter,large-sized soil aggregates,nitrogen mineralization and soil moisture *** term exclosure from grazing(~16 years)can enhance aboveground vegetation biomass and soil quality in terms of soil organic matter accumulation,soil aggregation,retention of soil moisture and nitrogen mineralization in this arid rangeland.

关键词： Rangeland Grazing Soil organic matter Aggregation Nitrogen mineralization

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