广西植物
廣西植物
엄서식물
GUIHAIA
2013年
4期
488-495
,共8页
木麻黄%凋落物%土壤养分%细根生物量
木痳黃%凋落物%土壤養分%細根生物量
목마황%조락물%토양양분%세근생물량
Casuarina equisetifolia%litter%soil nutrients%fine root biomass
通过对海口市桂林洋海岸木麻黄防护林地表凋落物进行持续清除处理,与保留凋落物层的对照样地进行比较实验,研究防护林凋落物-土壤养分-细根生物量三者之间的关系.结果表明：(1)处理样地与对照样地的年凋落物量分别是6．0162和5．9505 t?hm-2,但无显著性差异.两种样地一年内凋落物量变化的时间格局较一致.凋落物组成均为小枝占比例最高,且小枝凋落物量月动态与凋落物总量月动态相似,杂物占比例次之,皮＋枝占的比例最小；(2)N、P、K元素归还量的月动态变化在两样地中均较一致.两样地中小枝养分归还量的大小顺序为N＞K＞P；(3)处理样地在短时间无新鲜凋落物输入情况下,两样地的土壤养分含量无显著性差异；(4)两样地的细根生物量季节动态均呈现“单峰”特征,细根生物量在实验期间无显著性差异,但处理样地的细根生物量有随时间延长低于对照样地的趋势,清除凋落物的处理可能会引起细根生物量的减少.
通過對海口市桂林洋海岸木痳黃防護林地錶凋落物進行持續清除處理,與保留凋落物層的對照樣地進行比較實驗,研究防護林凋落物-土壤養分-細根生物量三者之間的關繫.結果錶明：(1)處理樣地與對照樣地的年凋落物量分彆是6．0162和5．9505 t?hm-2,但無顯著性差異.兩種樣地一年內凋落物量變化的時間格跼較一緻.凋落物組成均為小枝佔比例最高,且小枝凋落物量月動態與凋落物總量月動態相似,雜物佔比例次之,皮＋枝佔的比例最小；(2)N、P、K元素歸還量的月動態變化在兩樣地中均較一緻.兩樣地中小枝養分歸還量的大小順序為N＞K＞P；(3)處理樣地在短時間無新鮮凋落物輸入情況下,兩樣地的土壤養分含量無顯著性差異；(4)兩樣地的細根生物量季節動態均呈現“單峰”特徵,細根生物量在實驗期間無顯著性差異,但處理樣地的細根生物量有隨時間延長低于對照樣地的趨勢,清除凋落物的處理可能會引起細根生物量的減少.
통과대해구시계림양해안목마황방호임지표조락물진행지속청제처리,여보류조락물층적대조양지진행비교실험,연구방호림조락물-토양양분-세근생물량삼자지간적관계.결과표명：(1)처리양지여대조양지적년조락물량분별시6．0162화5．9505 t?hm-2,단무현저성차이.량충양지일년내조락물량변화적시간격국교일치.조락물조성균위소지점비례최고,차소지조락물량월동태여조락물총량월동태상사,잡물점비례차지,피＋지점적비례최소；(2)N、P、K원소귀환량적월동태변화재량양지중균교일치.량양지중소지양분귀환량적대소순서위N＞K＞P；(3)처리양지재단시간무신선조락물수입정황하,량양지적토양양분함량무현저성차이；(4)량양지적세근생물량계절동태균정현“단봉”특정,세근생물량재실험기간무현저성차이,단처리양지적세근생물량유수시간연장저우대조양지적추세,청제조락물적처리가능회인기세근생물량적감소.
The relations among litters,soil nutrients and fine root biomass of Casuarina equisetifolia plantation as windbreak were studied by comparing treatment (litters removed)and control (litters preserved)sites on the coast of Gui Linyang,Haikou City.The main results were as follows:(1)Annual litters in the sites of treatment and control were 6.0162 t?hmG2 and 5.9505 t?hmG2 respectively.According to the statistic analysis,there was no significant difference between the two sites.It seemed that the temporal patterns of litters were similar in the two sties.In the components of litters,the leaf litters took up the largest percentage and their monthly dynamics were similar with the total litters.The miscellaneous litters took the second place.Bark and branches litters took the least percentage;(2) It seemed that there was a same monthly pattern of N,P and K return from the litters in the two sites respectively.The order of quantity about the nutrients returned from the leaves was N>K>P;(3)If there was no fresh litter in the treatment site in a short time,the soil nutrients had no significant between the two sites;(4)The seasonal dynam-ics of fine root biomass had a“single apex”respectively and no significant difference between the two sites during the experiment,but with the time’s increase,the treatment site’s fine root biomass had a lower trend than the control site.Maybe one of the reasons on reducing the fine root biomass was litter clearing.
