Solid shelter tubes alleviate summer stresses during outplanting in drought-tolerant species of Mediterranean forests     

Rojas-Arévalo  Nadia  Ovalle  Juan F.  Oliet  Juan A.  Piper  Frida I.  Valenzuela  Patricio  Ginocchio  Rosanna  Arellano  Eduardo C. 《New Forests》2022,53(3):555-569

New Forests - The effect of shelter tubes on plant performance has been widely studied. Although, the role of shelter tubes in alleviating the effects of drought and high-irradiance stresses during...  相似文献   

Impacts of different forest management scenarios on forestry and reindeer husbandry     

Anu Korosuo  Per Sandström  Karin Öhman  Ljusk Ola Eriksson 《Scandinavian Journal of Forest Research》2014,29(7):234-251

In northern Sweden, the forests are used simultaneously for both timber production and reindeer husbandry. During the winter months, lichen is the most important fodder for reindeer. Forest management operations are generally considered having a negative impact on reindeer husbandry as harvesting and dense stands remove or obscure the ground lichen cover. In this study, we simulate three different scenarios for forest management, differing in the intensity and types of harvest operations. The resulting 100-year scenarios are analyzed with respect to their estimated suitability for providing reindeer pasture areas. Suitability is determined by vegetation type, stand density and stand height. The results indicate that the current trend of a decrease in lichen area will continue if existing forestry practice prevails. Implementing continuous cover forestry as a management alternative and carrying out precommercial thinning could halt the decrease in reindeer pasture area and even lead to a future increase in pasture area, with losses of approximately 5% in the net present value of forestry.  相似文献   

Breeding research on rose pigments. II. Combining ability analyses of variance of four flavonoids in F1 populations     

D. P. De Vries  Frida Garretsen  Lidwien A. M. Dubois  H. A. Van Keulen 《Euphytica》1980,29(1):115-120

Summary 18 Hybrid Tea-rose varieties were crossed and selfed in an incomplete diallel. In F₁ seedlings the relative contents of the flavonoids: pelargonidin, cyanidin, kaempferol and quercetin, were determined by means of paper chromatography. Inheritance of each pigment was mainly controlled by additive gene action. Combining ability analyses of variance of these pigments showed highly significant differences between GCA's of the varieties. The pigment content of parent varieties can be a useful basis for breeding.  相似文献   

Functions of time for growth characters,their evaluation and approximation to examine differences between genotypes     

Frida Garretsen  M. Keuls 《Euphytica》1986,35(1):11-15

Summary As a follow up to a previous paper on growth curves (Keuls & Garretsen, 1982) a procedure is described to derive functions of time for growth characters from elementary growth curves which are suited for statistical analysis.For each plot from the parameters , , of the second degree growth curves of type + (t–t) + (t–t)², corresponding functions of time (of harvest) are obtained for the derived growth characters: relative growth rate (of dry weight per plant), net assimilation rate, leaf area ratio, specific leaf area, leaf weight ratio. The elementary growth curves concern ln W, ln LA and ln LW, where W = dry weight per plant, LA = leaf area per plant, LW = leaf dry weight per plant.Only relative growth rate is a simple linear expression in t, i.e., + 2(t–t), where t represents average harvest time.The functions for the four other growth characters are approximated by quadratic functions in t, such that for each plot a curve is characterized by a triple of parameters f(t), f(t), % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaKabGfaammaalaaaba% Gaaiymaaqaaiaackdaaaaaaa!3946!\[\frac{1}{2}\]f(t), representing respectively mean, slope and curvature for that plot at time t The approximation of the function of time is given by f(t) + (t–t)f(t) + % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaKabGfaammaalaaaba% Gaaiymaaqaaiaackdaaaaaaa!3946!\[\frac{1}{2}\](t–t)²f(t).These sets of parameters per plot: (, , ) for ln W(t) etc.; (, 2, 0) for RGR(t) or (f(t), f(t), % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaKabGfaammaalaaaba% Gaaiymaaqaaiaackdaaaaaaa!3946!\[\frac{1}{2}\]f(t)) for the four other growth characters can be analysed by the MANOVA-procedure for 3 parameters as exemplified by Keuls & Garretsen (1982).  相似文献   

Uniform resistance to Cladosporium fulvum Cooke in tomato (Lycopersicon esculentum Mill.). 2. Investigations on F2's and F3's from diallel crosses     

Ietje W. Boukema  Frida Garretsen 《Euphytica》1975,24(1):105-116

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Grey speck disease,a non-parasitic post-harvest disorder of storage white cabbage (Brassica oleracea var. Capitata L. F. Alba D.C.)     

M. Nieuwhof  Frida Garretsen  A. Kraai 《Euphytica》1974,23(1):1-10

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A heritable colour deviation in red table beets (Beta vulgaris var. Rubra L.) 2. Mode of inheritance     

Nieuwhof  M.  Garretsen  Frida 《Euphytica》1974,23(2):365-367

Euphytica - A study was made on the inheritance of an orange-yellow colour deviation in red table beets. This disorder proved to be governed by a number of genes, presumably partly acting in an...  相似文献