检索结果-南通市图书馆

The effects of understory vegetation on P availability in Pinus radiata forest stands: A review

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2014年第3期25卷 489-500页

作者： a.arivin rivaie Soil and Earth Sciences Group Institute of Natural Resources Massey University

In many second-rotation Pinus radiata forest planta-tions, there has been a steady trend towards wider tree spacing and an increased rate of application of P fertiliser. Under these regimes, the potential for understory growth is expected to in-crease through increased light and greater nutrient resources. Therefore, understory vegetation could become a more signifi-cant component of P cycling in P. radiata forests than under closely-spaced stands. Studies have shown that growth rates and survival of trees is reduced in the presence of understory vegeta-tion due to the competition of understory vegetation with trees. Other studies have suggested that understory vegetation might have beneficial effects on nutrient cycling and conservation within forest stands. This review discusses the significance of understory vegetation in radiata pine forest stands, especially their role in enhancing or reducing P availability to forest trees.

关键词： understory vegetation significance phosphorus cycling Pinus radiata forests

Growth response of broom (Cytisus scoparius) growing with and without radiata pine (Pinus radiata) seedlings to different P levels in soils

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2011年第4期22卷 597-602页

作者： Achmad arivin rivaie Indonesian Agency for Agricultural Research and Development Jl. Tentara Pelajar 10 Bogor 16114 Indonesia

A study was carried out to test the effects of three rates of TSP （triple superphosphate）（0, 50, and 100 mg·kg^-1 P） on growth of broom with and without radiata pine seedlings and to determine the relationships between P concentrations in the broom shoot and dry matter yields with soil plant-available P （Bray-2 P）. A bulk sample of soil was collected from Kaweka forest at soil depth of 0-10 cm, in New Zealand on March 11, 2001. The forest area was not supplied with fertiliser at least 30 years. The results show that TSP application increased P avail- ability in the soil. The P availability concentration in soil of broom with radiata pine seedlings was higher than that in soil of broom alone. Bray-2 P concentrations had a significant logarithmic relationship with Pcon- centrations of broom shoot and an exponential relationship with dry matter weight of whole broom plant.

关键词： growth response to P fertiliser Cytisus scoparius L. Pinus radiata

Phosphorus fractions of fertiliser-derived P in an allophanic soil under Pinus radiata seedlings grown with broom and ryegrass

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2009年第3期20卷 229-236,286页

作者： Achmad arivin rivaie Russ Williams Tillman Indonesian Agency for Agricultural Research and Development Soil and Earth Sciences Institute of Natural Resources Massey University

Changes in phosphorus (P) fractions in a P deficient allophanic soil under P. radiata seedlings grown with broom (Cytisus scoparius L.) and ryegrass (Lolium multiflorum) in pots were studied 14 months after the application of triple superphosphate at the rates of 0, 50, and 100 μg·g-1, to determine the fate of fertiliser-derived P in the rhizosphere soils. Application of P fertiliser increased NaOH-Pi, NaOH-Po, and H2SO4-Pi concentrations in the soil, but decreased the residual-P concentration. The resin-Pi concentration, which is extremely low in this soil (1 to 3 μg·g-1 ), remained the same. The majority of the added fertiliser P was however recovered in the NaOH-Pi fraction (40%?49%). This is due to the high P fixation in this soil (92%). The second highest P recovery was in NaOH-Po fraction (7%?19%). Under P deficient condition or addition at the rate of 0 μg·g-1, the NaOH-Pi concentration in the radiata rhizosphere soil was lower than that in the bulk soil and broom and grass rhizosphere soils. This may be due to higher oxalate production by the roots and mycorrhiza under P deficient conditions which released some of the P fixed to the soils in the rhizosphere, which needs to be tested in future studies.

关键词： Cytisus scoparius Lolium multiflorum phosphorus fertiliser Pinus radiate rhizosphere soil phosphorus fractions

Phosphorus fertilizer induced changes in the soil available P,the P nutrition and the growth of Pinus radiata seedlings grown in association with understory

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2010年第2期21卷 129-136,I0003页

作者： Achmad arivin rivaie Russ Williams Tillman Indonesian Agency for Agricultural Research and Development Soil and Earth Sciences Institute of Natural ResourcesMassey University

A study was carried out to investigate changes in the soil plant-available P,the P nutrition and the growth of Pinus radiata seedlings grown in association with understory,broom（Cytisus scoparius L.） or ryegrass（Lolium multiflorum） on Orthic Allophanic Soil,following the application of three rates of triple superphosphate（TSP）（0,50,and 100 mg·kg^-1P） under a glasshouse *** application of P fertilizer enhanced P availability in the rhizospheric of radiata seedlings and the bulk soils in a P-deficient site.P availability in the rhizospheric soils of ryegrass and broom,grown in association with radiata,were also increased by the presence of radiata roots.P concentrations in new shoot needles,old shoot needles,stem and roots of radiata pine increased with increase rates of TSP application,but the effects of ryegrass and broom on P nutrition of radiata seedlings depended on the soil P *** the absence of P fertilizer addition（control treatment）,P concentrations in new shoot needles,old shoot needles,stem,and roots of radiata grown in association with broom were higher than those with ryegrass,whereas,when P fertilizer was added（50 and 100 mg·kg^-1） the P concentration was *** is probably related to the growth of broom that may have removed much of the plant-available P in the soil as indicated by the consistently lower Bray-2 P concentration in the rhizosphere soil of radiata in association with broom than that in the rhizosphere soil of radiata in association with grass at the two high P ***,in the high P fertile soil（application rate of 100 mg·kg^-1）,the dry matter yield of radiata was lower when it was grown with broom than with *** result suggests that in moderate to high P fertile soils,*** seedlings grow better with ryegrass than with broom,because broom grows vigorously in high P fertile soil and competes with *** for P and perhaps for other nutrients as well.

关键词： phosphorus fertilizer Pinus radiata understory rhizosphere soil available P P nutrition plant growth