CAJ | 학술논문

为了研究固定沙丘土壤N素空间分布特征,选择以栽植小叶锦鸡儿25年后的固定沙丘为研究对象,从迎风坡、顶坡和背风坡3个位置4个层次(0～5、5～10、10～20和20～40 cm)进行取样分析.研究结果表明:全N、NO_3~--N和NH_4~+-N含量均随着土层加深而呈现出减少的趋势,0～5 cm土层显著高于其他各层.表层土壤受凋落物的影响较大,从而相对于深层土壤来说积累了更多的N素.全N、NO_3~--N和NH_4~+-N含量在不同坡位间存在显著差异(p＜0.01):全N和NO_3~--N含量在迎风坡较高,而NH_4~+-N含量在背风坡较高.丛下全N、NO_3~--N和NH_4~+-N的含量显著高于丛间(p＜0.01).土壤电导率与全N、NO_3~--N、NH_4~+-N含量呈显著正相关,而pH与NO_3~--N、NH_4~+-N含量呈显著负相关,NO_3~--N、NH_4~+-N的富集降低了土壤pH值.小叶锦鸡儿的栽植对沙土改良具有重要意义.
위료연구고정사구토양N소공간분포특정,선택이재식소협금계인25년후적고정사구위연구대상,종영풍파、정파화배풍파3개위치4개층차(0～5、5～10、10～20화20～40 cm)진행취양분석.연구결과표명:전N、NO_3~--N화NH_4~+-N함량균수착토층가심이정현출감소적추세,0～5 cm토층현저고우기타각층.표층토양수조락물적영향교대,종이상대우심층토양래설적루료경다적N소.전N、NO_3~--N화NH_4~+-N함량재불동파위간존재현저차이(p＜0.01):전N화NO_3~--N함량재영풍파교고,이NH_4~+-N함량재배풍파교고.총하전N、NO_3~--N화NH_4~+-N적함량현저고우총간(p＜0.01).토양전도솔여전N、NO_3~--N、NH_4~+-N함량정현저정상관,이pH여NO_3~--N、NH_4~+-N함량정현저부상관,NO_3~--N、NH_4~+-N적부집강저료토양pH치.소협금계인적재식대사토개량구유중요의의.
To study the spatial distributions of soil nitrogen in stable sand dune,samples were collected at different depths (0-5,5-10,10-20 and 20-40 cm) from windward slope,top slope and leeward slope in the stable sand dune of Horqin Sandy land after the establishment of Caragana microphylla Lam for 25 years.The results showed that the contents of total N,NO_3~--N and NH_4~+-N decreased with the increase of soil layers.The differences of total N,NO_3~--N and NH_4~+-N from different slopes were significant (p＜0.01),and the differences under shrub soil were higher than under shrubs (p＜0.01).Nutrient contents at depth of 0-5 cm were higher than at other layers,which suggested more nitrogen was accumulated in surface layer as result of litter falling.The correlations between electrical conductivity and contents of total N,NO_3~--N and NH_4~+-N were positive significantly (p＜0.01),but the correlations between pH and the contents of NO_3~--N and NH_4~+-N were negative significantly (p＜0.01).Our results revealed that the enrichment of NO_3~--N and NH_4~+-N can decrease pH value.The establishment of Caragana microphylla plays an important role in improving sandy land soil.