02146nas a2200217   4500008004100000245012800041210006900169300001400238490000700252520144500259100001601704700001701720700001701737700001901754700002801773700001701801700001901818700001901837700001701856856005501873       2018                        eng d00aLong-term effects of grazing and topography on extra-radical hyphae of arbuscular mycorrhizal fungi in semi-arid grasslands0 aLongterm effects of grazing and topography on extraradical hypha  a117 - 1270 v283 a<p>Grazing and topography have drastic effects on plant communities and soil properties. These effects are thought to influence arbuscular mycorrhizal (AM) fungi. However, the simultaneous impacts of grazing pressure (sheep&nbsp;ha<sup>-1</sup>) and topography on plant and soil factors and their relationship to the production of extra-radical AM hyphae are not well understood. Our 10-year study assessed relationships between grazing, plant species richness, aboveground plant productivity, soil nutrients, edaphic properties, and AM hyphal length density (HLD) in different topographic areas (flat or sloped). We found HLD linearly declined with increasing grazing pressure (1.5-9.0 sheep&nbsp;ha<sup>-1</sup>) in sloped areas, but HLD was greatest at moderate grazing pressure (4.5 sheep&nbsp;ha<sup>-1</sup>) in flat areas. Structural equation modeling indicates grazing reduces HLD by altering soil nutrient dynamics in sloped areas, but non-linearly influences HLD through plant community and edaphic changes in flat areas. Our findings highlight how topography influences key plant and soil factors, thus regulating the effects of grazing pressure on extra-radical hyphal production of AM fungi in grasslands. Understanding how grazing and topography influence AM fungi in semi-arid grasslands is vital, as globally, severe human population pressure and increasing demand for food aggravate the grazing intensity in grasslands.</p>1 aRen, Haiyan1 aGui, Weiyang1 aBai, Yongfei1 aStein, Claudia1 aRodrigues, Jorge, L. M.1 aWilson, G.T.1 aCobb, Adam, B.1 aZhang, Yingjun1 aYang, Gaowen  uhttp://link.springer.com/10.1007/s00572-017-0812-x