平茬高度对人工固沙灌木柠条锦鸡儿群落的影响

Effect of Stump Height on Artificial Sand-fixing Shrubs Caragana korshinskii Community

针对科尔沁沙地优良固沙灌丛柠条锦鸡儿(Caragana korshinskii)群落,探讨未平茬(CK)、留茬0 cm(L-0)、留茬50 cm(L-50)、留茬100 cm(L-100)对灌木、草本及土壤养分的影响。结果表明:L-50留茬基部萌生的新枝生物量显著高于其他处理;L-0灌丛基部萌生的新枝数量、比叶面积和叶生物量占比均显著高于其他处理。L-0灌丛间的植被盖度、生物量和Shannon-Weiner指数分别为30.2%、217.0 g·m和25.5,显著高于其他处理;灌丛下草本植被数量、生物量和生物多样性指数则是L-50处理最高。相同平茬处理灌丛下的土壤TN和TC高于灌丛间,且以L-0处理为最高。平茬处理对灌木植株复壮和草本植被恢复作用明显,但L-0处理更有利于灌木新生枝条上的叶和灌丛间草本植被生长,而L-50处理则更利于灌丛新生枝条自身和灌丛下草本植被生长。

Aiming at fine sand-fixing shrubs Caragana korshinskii community in Horqin Sandy Land, this paper mainly discussed the effect of non-stump(CK),stump height 0 cm(L-0),stump height 50 cm(L-50),and stump height 100 cm(L-100) on the shrubs, herbs and soil nutrients. The results showed that L-50 treatment could increase the biomass of new sprouting shoots from stump positions and shrub roots significantly, but L-0 treatment definitely increased the new sprouting shoots number, specific leaf area(SLA) and the proportion of leaves biomass in new shoots. Under L-0 treatment, vegetation coverage, biomass and Shannon-Weiner index were 30.2%,217.0 g·mand 25.5 respectively, which was significantly higher than other treatments. Under shrubs canopies, plant abundance, biomass and species diversity index all showed the highest values of L-50 treatment. With the same stump treatment, soil total TN and TC in shrub canopies were higher than that among shrubs, and L-0 treatment was the highest. The conclusion was that stump measure showed very obvious improvement in shrubs recovery and herbaceous vegetation restoration. While stump L-0 treatment was more favor of leaves growth from new sprouting shoots and herbs restoration among shrubs, stump L-50 treatment was more conductive to the growth of new sprouting shoots and herbs restoration under shrub canopies.